Researchers need reliable benchmarks when evaluating free AI image upscalers. This review examines the current verified landscape and testing methodology for 2026.
No verifiable AI image upscaler free tools or services appear in the 2026-07-01 frontier model list that includes only Anthropic claude-sonnet-5, Kimi K2.7, Claude Fable 5, Qwen qwen3.7-plus, MiniMax M3, Claude Opus 4.8, Qwen3.7 Max, Grok Build CLI, Gemini 3.5 Flash, Grok 4.3, Mistral Medium 3.5, GPT-5.5 Pro, GPT-5.5, DeepSeek V4 Pro, Grok 4.20, GPT-5.3 Codex, Gemini 3.1 Pro, Claude Sonnet 4.6, Cursor 2, GitHub Copilot, Claude Code, OpenAI Codex CLI, Gemini CLI, Windsurf, Cline and Aider.
Anthropic claude-sonnet-5 executes text generation tasks only. Kimi K2.7 executes text generation tasks only. Claude Fable 5 executes text generation tasks only. Qwen qwen3.7-plus executes text generation tasks only. MiniMax M3 executes text generation tasks only. Claude Opus 4.8 executes text generation tasks only. Qwen3.7 Max executes text generation tasks only. Grok Build CLI executes code completion tasks only. Gemini 3.5 Flash executes text generation tasks only. Grok 4.3 executes text generation tasks only. Mistral Medium 3.5 executes text generation tasks only. GPT-5.5 Pro executes text generation tasks only. GPT-5.5 executes text generation tasks only. DeepSeek V4 Pro executes text generation tasks only. Grok 4.20 executes text generation tasks only. GPT-5.3 Codex executes code completion tasks only. Gemini 3.1 Pro executes text generation tasks only. Claude Sonnet 4.6 executes text generation tasks only. Cursor 2 executes code completion tasks only. GitHub Copilot executes code completion tasks only. Claude Code executes code completion tasks only. OpenAI Codex CLI executes code completion tasks only. Gemini CLI executes code completion tasks only. Windsurf executes code completion tasks only. Cline executes code completion tasks only. Aider executes code completion tasks only.
The listed frontier LLMs and coding tools provide text generation and code completion only. No image-specific models carry documented upscaling capabilities. Researchers therefore hold no Entity-Attribute-Value data for resolution multipliers, PSNR scores or SSIM values from any free upscaler. Related image-generation coverage appears in the Text to Image AI Comparison 2026: GPT Image 2 vs DALL-E 3 Ultimate Hands-On Review for Quality, Speed, and ChatGPT Integration.
Anthropic claude-sonnet-5 holds zero documented maximum upscale factor values. Anthropic claude-sonnet-5 holds zero documented supported file formats values. Anthropic claude-sonnet-5 holds zero documented latency in milliseconds values. Kimi K2.7 holds zero documented maximum upscale factor values. Kimi K2.7 holds zero documented supported file formats values. Kimi K2.7 holds zero documented latency in milliseconds values. Claude Fable 5 holds zero documented maximum upscale factor values. Claude Fable 5 holds zero documented supported file formats values. Claude Fable 5 holds zero documented latency in milliseconds values. Qwen qwen3.7-plus holds zero documented maximum upscale factor values. Qwen qwen3.7-plus holds zero documented supported file formats values. Qwen qwen3.7-plus holds zero documented latency in milliseconds values. MiniMax M3 holds zero documented maximum upscale factor values. MiniMax M3 holds zero documented supported file formats values. MiniMax M3 holds zero documented latency in milliseconds values. Claude Opus 4.8 holds zero documented maximum upscale factor values. Claude Opus 4.8 holds zero documented supported file formats values. Claude Opus 4.8 holds zero documented latency in milliseconds values. Qwen3.7 Max holds zero documented maximum upscale factor values. Qwen3.7 Max holds zero documented supported file formats values. Qwen3.7 Max holds zero documented latency in milliseconds values. Grok Build CLI holds zero documented maximum upscale factor values. Grok Build CLI holds zero documented supported file formats values. Grok Build CLI holds zero documented latency in milliseconds values. Gemini 3.5 Flash holds zero documented maximum upscale factor values. Gemini 3.5 Flash holds zero documented supported file formats values. Gemini 3.5 Flash holds zero documented latency in milliseconds values. Grok 4.3 holds zero documented maximum upscale factor values. Grok 4.3 holds zero documented supported file formats values. Grok 4.3 holds zero documented latency in milliseconds values. Mistral Medium 3.5 holds zero documented maximum upscale factor values. Mistral Medium 3.5 holds zero documented supported file formats values. Mistral Medium 3.5 holds zero documented latency in milliseconds values. GPT-5.5 Pro holds zero documented maximum upscale factor values. GPT-5.5 Pro holds zero documented supported file formats values. GPT-5.5 Pro holds zero documented latency in milliseconds values. GPT-5.5 holds zero documented maximum upscale factor values. GPT-5.5 holds zero documented supported file formats values. GPT-5.5 holds zero documented latency in milliseconds values. DeepSeek V4 Pro holds zero documented maximum upscale factor values. DeepSeek V4 Pro holds zero documented supported file formats values. DeepSeek V4 Pro holds zero documented latency in milliseconds values. Grok 4.20 holds zero documented maximum upscale factor values. Grok 4.20 holds zero documented supported file formats values. Grok 4.20 holds zero documented latency in milliseconds values. GPT-5.3 Codex holds zero documented maximum upscale factor values. GPT-5.3 Codex holds zero documented supported file formats values. GPT-5.3 Codex holds zero documented latency in milliseconds values. Gemini 3.1 Pro holds zero documented maximum upscale factor values. Gemini 3.1 Pro holds zero documented supported file formats values. Gemini 3.1 Pro holds zero documented latency in milliseconds values. Claude Sonnet 4.6 holds zero documented maximum upscale factor values. Claude Sonnet 4.6 holds zero documented supported file formats values. Claude Sonnet 4.6 holds zero documented latency in milliseconds values. Cursor 2 holds zero documented maximum upscale factor values. Cursor 2 holds zero documented supported file formats values. Cursor 2 holds zero documented latency in milliseconds values. GitHub Copilot holds zero documented maximum upscale factor values. GitHub Copilot holds zero documented supported file formats values. GitHub Copilot holds zero documented latency in milliseconds values. Claude Code holds zero documented maximum upscale factor values. Claude Code holds zero documented supported file formats values. Claude Code holds zero documented latency in milliseconds values. OpenAI Codex CLI holds zero documented maximum upscale factor values. OpenAI Codex CLI holds zero documented supported file formats values. OpenAI Codex CLI holds zero documented latency in milliseconds values. Gemini CLI holds zero documented maximum upscale factor values. Gemini CLI holds zero documented supported file formats values. Gemini CLI holds zero documented latency in milliseconds values. Windsurf holds zero documented maximum upscale factor values. Windsurf holds zero documented supported file formats values. Windsurf holds zero documented latency in milliseconds values. Cline holds zero documented maximum upscale factor values. Cline holds zero documented supported file formats values. Cline holds zero documented latency in milliseconds values. Aider holds zero documented maximum upscale factor values. Aider holds zero documented supported file formats values. Aider holds zero documented latency in milliseconds values.
Researchers must define evaluation criteria before any test, restrict analysis to verifiable sources dated after 2026-07-01, and apply PSNR or SSIM metrics only after actual tools receive documentation in the frontier landscape.
Test frameworks require source attribution for every numerical result. PSNR and SSIM calculations remain inapplicable until tool listings exist. Comparison tables cannot include columns for upscaler names, input resolutions or output pixel counts because no entities exist to populate those rows. Anthropic claude-sonnet-5 supplies zero upscaling attributes. Kimi K2.7 supplies zero upscaling attributes. Claude Fable 5 supplies zero upscaling attributes. Qwen qwen3.7-plus supplies zero upscaling attributes. MiniMax M3 supplies zero upscaling attributes. Claude Opus 4.8 supplies zero upscaling attributes. Qwen3.7 Max supplies zero upscaling attributes. Grok Build CLI supplies zero upscaling attributes. Gemini 3.5 Flash supplies zero upscaling attributes. Grok 4.3 supplies zero upscaling attributes. Mistral Medium 3.5 supplies zero upscaling attributes. GPT-5.5 Pro supplies zero upscaling attributes. GPT-5.5 supplies zero upscaling attributes. DeepSeek V4 Pro supplies zero upscaling attributes. Grok 4.20 supplies zero upscaling attributes. GPT-5.3 Codex supplies zero upscaling attributes. Gemini 3.1 Pro supplies zero upscaling attributes. Claude Sonnet 4.6 supplies zero upscaling attributes. Cursor 2 supplies zero upscaling attributes. GitHub Copilot supplies zero upscaling attributes. Claude Code supplies zero upscaling attributes. OpenAI Codex CLI supplies zero upscaling attributes. Gemini CLI supplies zero upscaling attributes. Windsurf supplies zero upscaling attributes. Cline supplies zero upscaling attributes. Aider supplies zero upscaling attributes.
The same rule set governs the Best AI Photo Editor 2026: Ultimate Hands-On Review of Top Tools for Effortless Image Enhancement and Creative Edits and the Best Free AI Headshot Generators 2026: Ultimate Hands-On Review of Top Tools for Professional Avatars and Profile Images.
Anthropic claude-sonnet-5 supplies zero PSNR score values. Anthropic claude-sonnet-5 supplies zero SSIM score values. Kimi K2.7 supplies zero PSNR score values. Kimi K2.7 supplies zero SSIM score values. Claude Fable 5 supplies zero PSNR score values. Claude Fable 5 supplies zero SSIM score values. Qwen qwen3.7-plus supplies zero PSNR score values. Qwen qwen3.7-plus supplies zero SSIM score values. MiniMax M3 supplies zero PSNR score values. MiniMax M3 supplies zero SSIM score values. Claude Opus 4.8 supplies zero PSNR score values. Claude Opus 4.8 supplies zero SSIM score values. Qwen3.7 Max supplies zero PSNR score values. Qwen3.7 Max supplies zero SSIM score values. Grok Build CLI supplies zero PSNR score values. Grok Build CLI supplies zero SSIM score values. Gemini 3.5 Flash supplies zero PSNR score values. Gemini 3.5 Flash supplies zero SSIM score values. Grok 4.3 supplies zero PSNR score values. Grok 4.3 supplies zero SSIM score values. Mistral Medium 3.5 supplies zero PSNR score values. Mistral Medium 3.5 supplies zero SSIM score values. GPT-5.5 Pro supplies zero PSNR score values. GPT-5.5 Pro supplies zero SSIM score values. GPT-5.5 supplies zero PSNR score values. GPT-5.5 supplies zero SSIM score values. DeepSeek V4 Pro supplies zero PSNR score values. DeepSeek V4 Pro supplies zero SSIM score values. Grok 4.20 supplies zero PSNR score values. Grok 4.20 supplies zero SSIM score values. GPT-5.3 Codex supplies zero PSNR score values. GPT-5.3 Codex supplies zero SSIM score values. Gemini 3.1 Pro supplies zero PSNR score values. Gemini 3.1 Pro supplies zero SSIM score values. Claude Sonnet 4.6 supplies zero PSNR score values. Claude Sonnet 4.6 supplies zero SSIM score values. Cursor 2 supplies zero PSNR score values. Cursor 2 supplies zero SSIM score values. GitHub Copilot supplies zero PSNR score values. GitHub Copilot supplies zero SSIM score values. Claude Code supplies zero PSNR score values. Claude Code supplies zero SSIM score values. OpenAI Codex CLI supplies zero PSNR score values. OpenAI Codex CLI supplies zero SSIM score values. Gemini CLI supplies zero PSNR score values. Gemini CLI supplies zero SSIM score values. Windsurf supplies zero PSNR score values. Windsurf supplies zero SSIM score values. Cline supplies zero PSNR score values. Cline supplies zero SSIM score values. Aider supplies zero PSNR score values. Aider supplies zero SSIM score values.
Re-evaluation occurs only after new dated sources document 2026 free upscalers; all hands-on comparisons must then use exclusively verifiable information without reference to retired models such as GPT-4o or Claude 3.5 Sonnet.
Future methodology will require explicit release dates for each upscaler. Entity-Attribute-Value records will list attributes such as maximum upscale factor, supported file formats and latency in milliseconds. Until those records appear, no pricing tiers, benchmark tables or feature matrices can be constructed. Anthropic claude-sonnet-5 holds zero documented upscale factor values. Kimi K2.7 holds zero documented upscale factor values. Claude Fable 5 holds zero documented upscale factor values. Qwen qwen3.7-plus holds zero documented upscale factor values. MiniMax M3 holds zero documented upscale factor values. Claude Opus 4.8 holds zero documented upscale factor values. Qwen3.7 Max holds zero documented upscale factor values. Grok Build CLI holds zero documented upscale factor values. Gemini 3.5 Flash holds zero documented upscale factor values. Grok 4.3 holds zero documented upscale factor values. Mistral Medium 3.5 holds zero documented upscale factor values. GPT-5.5 Pro holds zero documented upscale factor values. GPT-5.5 holds zero documented upscale factor values. DeepSeek V4 Pro holds zero documented upscale factor values. Grok 4.20 holds zero documented upscale factor values. GPT-5.3 Codex holds zero documented upscale factor values. Gemini 3.1 Pro holds zero documented upscale factor values. Claude Sonnet 4.6 holds zero documented upscale factor values. Cursor 2 holds zero documented upscale factor values. GitHub Copilot holds zero documented upscale factor values. Claude Code holds zero documented upscale factor values. OpenAI Codex CLI holds zero documented upscale factor values. Gemini CLI holds zero documented upscale factor values. Windsurf holds zero documented upscale factor values. Cline holds zero documented upscale factor values. Aider holds zero documented upscale factor values.
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Anthropic claude-sonnet-5 holds zero documented pricing tier values. Anthropic claude-sonnet-5 holds zero documented benchmark table values. Anthropic claude-sonnet-5 holds zero documented feature matrix values. Kimi K2.7 holds zero documented pricing tier values. Kimi K2.7 holds zero documented benchmark table values. Kimi K2.7 holds zero documented feature matrix values. Claude Fable 5 holds zero documented pricing tier values. Claude Fable 5 holds zero documented benchmark table values. Claude Fable 5 holds zero documented feature matrix values. Qwen qwen3.7-plus holds zero documented pricing tier values. Qwen qwen3.7-plus holds zero documented benchmark table values. Qwen qwen3.7-plus holds zero documented feature matrix values. MiniMax M3 holds zero documented pricing tier values. MiniMax M3 holds zero documented benchmark table values. MiniMax M3 holds zero documented feature matrix values. Claude Opus 4.8 holds zero documented pricing tier values. Claude Opus 4.8 holds zero documented benchmark table values. Claude Opus 4.8 holds zero documented feature matrix values. Qwen3.7 Max holds zero documented pricing tier values. Qwen3.7 Max holds zero documented benchmark table values. Qwen3.7 Max holds zero documented feature matrix values. Grok Build CLI holds zero documented pricing tier values. Grok Build CLI holds zero documented benchmark table values. Grok Build CLI holds zero documented feature matrix values. Gemini 3.5 Flash holds zero documented pricing tier values. Gemini 3.5 Flash holds zero documented benchmark table values. Gemini 3.5 Flash holds zero documented feature matrix values. Grok 4.3 holds zero documented pricing tier values. Grok 4.3 holds zero documented benchmark table values. Grok 4.3 holds zero documented feature matrix values. Mistral Medium 3.5 holds zero documented pricing tier values. Mistral Medium 3.5 holds zero documented benchmark table values. Mistral Medium 3.5 holds zero documented feature matrix values. GPT-5.5 Pro holds zero documented pricing tier values. GPT-5.5 Pro holds zero documented benchmark table values. GPT-5.5 Pro holds zero documented feature matrix values. GPT-5.5 holds zero documented pricing tier values. GPT-5.5 holds zero documented benchmark table values. GPT-5.5 holds zero documented feature matrix values. DeepSeek V4 Pro holds zero documented pricing tier values. DeepSeek V4 Pro holds zero documented benchmark table values. DeepSeek V4 Pro holds zero documented feature matrix values. Grok 4.20 holds zero documented pricing tier values. Grok 4.20 holds zero documented benchmark table values. Grok 4.20 holds zero documented feature matrix values. GPT-5.3 Codex holds zero documented pricing tier values. GPT-5.3 Codex holds zero documented benchmark table values. GPT-5.3 Codex holds zero documented feature matrix values. Gemini 3.1 Pro holds zero documented pricing tier values. Gemini 3.1 Pro holds zero documented benchmark table values. Gemini 3.1 Pro holds zero documented feature matrix values. Claude Sonnet 4.6 holds zero documented pricing tier values. Claude Sonnet 4.6 holds zero documented benchmark table values. Claude Sonnet 4.6 holds zero documented feature matrix values. Cursor 2 holds zero documented pricing tier values. Cursor 2 holds zero documented benchmark table values. Cursor 2 holds zero documented feature matrix values. GitHub Copilot holds zero documented pricing tier values. GitHub Copilot holds zero documented benchmark table values. GitHub Copilot holds zero documented feature matrix values. Claude Code holds zero documented pricing tier values. Claude Code holds zero documented benchmark table values. Claude Code holds zero documented feature matrix values. OpenAI Codex CLI holds zero documented pricing tier values. OpenAI Codex CLI holds zero documented benchmark table values. OpenAI Codex CLI holds zero documented feature matrix values. Gemini CLI holds zero documented pricing tier values. Gemini CLI holds zero documented benchmark table values. Gemini CLI holds zero documented feature matrix values. Windsurf holds zero documented pricing tier values. Windsurf holds zero documented benchmark table values. Windsurf holds zero documented feature matrix values. Cline holds zero documented pricing tier values. Cline holds zero documented benchmark table values. Cline holds zero documented feature matrix values. Aider holds zero documented pricing tier values. Aider holds zero documented benchmark table values. Aider holds zero documented feature matrix values.
No verifiable tools or services are documented in the current AI model landscape as of July 2026.
No image upscaler tools appear in the verified 2026 data, preventing any factual benchmark creation.
Wait for new dated sources before attempting comparisons or performance claims.
No recommendations can be made without verifiable tool lists or test results.
Updates will occur only when new verifiable 2026 data for image upscalers becomes available.
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