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GPT 5.1 Codex Max vs Claude Opus 5.5

At a glance

Extended-context coding model for large codebase operations.

400K ctx$1.25/$10.00 per M

Anthropic's new flagship for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.

1M ctx$4.00/$20.00 per M
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Cheaper57%
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—
Agentic
Terminal Tasks60.4%Novel Reasoning—Task Horizon3.7h
Reasoning
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Reasoning & Knowledge
Graduate Science90.6%Factual Recall72.2%
Math
Competition Math100.0%
Agentic
Terminal Tasks—Novel Reasoning92.5%Task Horizon—
Specs
400K
Context
128K
Max output
Dec 2025
Released
1M
Context
128K
Max output
Sep 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input69%$1.25/M tokens
Output50%$10.00/M tokens
Cache read37%$0.13/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input$4.00/M tokens
Output$20.00/M tokens
Cache read$0.20/M tokens
Cache write$5.00/M tokens
Web search$0.01/search
Chat with GPT 5.1 Codex MaxGo to model
Chat with Claude Opus 5.5Go to model
Frequently Asked Questions: GPT 5.1 Codex Max vs Claude Opus 5.5▼

Which is better, GPT 5.1 Codex Max or Claude Opus 5.5?

▼

Both GPT 5.1 Codex Max and Claude Opus 5.5 are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, GPT 5.1 Codex Max or Claude Opus 5.5?

▼

GPT 5.1 Codex Max has a lower blended cost. GPT 5.1 Codex Max: $1.25 input / $10.00 output. Claude Opus 5.5: $4.00 input / $20.00 output.

Which has a larger context window, GPT 5.1 Codex Max or Claude Opus 5.5?

▼

Claude Opus 5.5 has a larger context window: GPT 5.1 Codex Max supports 400K tokens vs Claude Opus 5.5 at 1M tokens.

Do both GPT 5.1 Codex Max and Claude Opus 5.5 support vision?

▼

Yes, both GPT 5.1 Codex Max and Claude Opus 5.5 support vision/image input.

What are the key differences between GPT 5.1 Codex Max and Claude Opus 5.5?

▼

Key differences: GPT 5.1 Codex Max is significantly cheaper. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GPT 5.1 Codex Max and Claude Opus 5.5 for free on idapt.app to see which performs better for your specific needs.

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