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GPT 5.1 Codex Max vs Claude Sonnet 5

At a glance

Extended-context coding model for large codebase operations.

400K ctx$1.25/$10.00 per M

Anthropic's fifth-generation Sonnet — near-Opus intelligence at Sonnet speed and price.

801M ctx$2.00/$10.00 per M#26/92
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 2026-07-10
Cheaper14%
Capability
Capability—
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—
Agentic
Terminal Tasks60.4%Task Horizon2.7h
Reasoning
CI 72.7-84.7Provisional
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Capability
CapabilityECI80.1
Reasoning & Knowledge
Graduate Science90.5%Factual Recall25.0%
Math
Competition Math94.7%
Agentic
Terminal Tasks—Task Horizon—
Specs
400K
Context
128K
Max output
Dec 2025
Released
1M
Context
128K
Max output
Jun 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input38%$1.25/M tokens
Output$10.00/M tokens
Cache read37%$0.13/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input$2.00/M tokens
Output$10.00/M tokens
Cache read$0.20/M tokens
Cache write$2.50/M tokens
Web search$0.01/search
Chat with GPT 5.1 Codex MaxGo to model
Chat with Claude Sonnet 5Go to model
Frequently Asked Questions: GPT 5.1 Codex Max vs Claude Sonnet 5▼

Which is better, GPT 5.1 Codex Max or Claude Sonnet 5?

▼

Both GPT 5.1 Codex Max and Claude Sonnet 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 Sonnet 5?

▼

GPT 5.1 Codex Max has a lower blended cost. GPT 5.1 Codex Max: $1.25 input / $10.00 output. Claude Sonnet 5: $2.00 input / $10.00 output.

Which has a larger context window, GPT 5.1 Codex Max or Claude Sonnet 5?

▼

Claude Sonnet 5 has a larger context window: GPT 5.1 Codex Max supports 400K tokens vs Claude Sonnet 5 at 1M tokens.

Do both GPT 5.1 Codex Max and Claude Sonnet 5 support vision?

▼

Yes, both GPT 5.1 Codex Max and Claude Sonnet 5 support vision/image input.

What are the key differences between GPT 5.1 Codex Max and Claude Sonnet 5?

▼

GPT 5.1 Codex Max and Claude Sonnet 5 have similar overall capabilities. The main differences lie in pricing, context window size, and provider-specific strengths. Use this comparison page to review all metrics side by side.

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 Sonnet 5 for free on idapt.app to see which performs better for your specific needs.

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