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Claude Sonnet 5.5 vs GPT 5.1 Codex Mini

At a glance

Anthropic's Sonnet-class model for well-scoped everyday work, a direct upgrade over Claude Sonnet 5.

1M ctx$2.00/$10.00 per M

Compact coding model for fast, cost-efficient development tasks.

400K ctx$0.25/$2.00 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
AgenticInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Reasoning & Knowledge
Graduate Science95.6%Factual Recall46.5%
Math
Competition Math100.0%
Agentic
Terminal Tasks—
Reasoning
CodingInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Cheaper83%
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—
Agentic
Terminal Tasks61.6%
Specs
1M
Context
128K
Max output
Sep 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
Input88%$0.25/M tokens
Output80%$2.00/M tokens
Cache read85%$0.03/M tokens
Web search$0.01/search
Chat with Claude Sonnet 5.5Go to model
Chat with GPT 5.1 Codex MiniGo to model
Frequently Asked Questions: Claude Sonnet 5.5 vs GPT 5.1 Codex Mini▼

Which is better, Claude Sonnet 5.5 or GPT 5.1 Codex Mini?

▼

Both Claude Sonnet 5.5 and GPT 5.1 Codex Mini 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 5.5 or GPT 5.1 Codex Mini?

▼

GPT 5.1 Codex Mini has a lower blended cost. Claude Sonnet 5.5: $2.00 input / $10.00 output. GPT 5.1 Codex Mini: $0.25 input / $2.00 output.

Which has a larger context window, Claude Sonnet 5.5 or GPT 5.1 Codex Mini?

▼

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

Do both Claude Sonnet 5.5 and GPT 5.1 Codex Mini support vision?

▼

Yes, both Claude Sonnet 5.5 and GPT 5.1 Codex Mini support vision/image input.

What are the key differences between Claude Sonnet 5.5 and GPT 5.1 Codex Mini?

▼

Key differences: GPT 5.1 Codex Mini 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 Claude Sonnet 5.5 and GPT 5.1 Codex Mini for free on idapt.app to see which performs better for your specific needs.

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