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Claude Sonnet 5 vs GPT 5.1 Codex

At a glance

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

801M ctx$2.00/$10.00 per M#26/92

Previous-generation coding-optimized model for software engineering.

400K ctx$1.25/$10.00 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
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%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper14%
Capability
Capability—
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—
Specs
1M
Context
128K
Max output
Jun 2026
Released
400K
Context
128K
Max output
Nov 2025
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
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
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
Chat with Claude Sonnet 5Go to model
Chat with GPT 5.1 CodexGo to model
Frequently Asked Questions: Claude Sonnet 5 vs GPT 5.1 Codex▼

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

▼

Both Claude Sonnet 5 and GPT 5.1 Codex 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, Claude Sonnet 5 or GPT 5.1 Codex?

▼

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

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

▼

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

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

▼

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

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

▼

Claude Sonnet 5 and GPT 5.1 Codex 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 Claude Sonnet 5 and GPT 5.1 Codex for free on idapt.app to see which performs better for your specific needs.

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