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Claude Opus 5.5 vs GPT 4o Mini

At a glance

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

OpenAI's most advanced small model — fast and affordable.

61128K ctx$0.15/$0.60 per M#69/92
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
AgenticInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Capability
Capability—
Reasoning & Knowledge
Graduate Science140%90.6%Factual Recall770%72.2%
Math
Math Problems—Competition Math1340%100.0%
Coding
Code Editing—
Agentic
Novel Reasoning92.5%
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-10-02
Cheaper97%
Capability
CapabilityECI60.8
Reasoning & Knowledge
Graduate Science37.7%Factual Recall8.3%
Math
Math Problems52.6%Competition Math6.9%
Coding
Code Editing3.6%
Agentic
Novel Reasoning—
Specs
1M
Context
128K
Max output
Sep 2026
Released
128K
Context
16K
Max output
Jul 2024
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
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
Live pricing, shown before you run
Input96%$0.15/M tokens
Output97%$0.60/M tokens
Cache read63%$0.07/M tokens
Chat with Claude Opus 5.5Go to model
Chat with GPT 4o MiniGo to model
Frequently Asked Questions: Claude Opus 5.5 vs GPT 4o Mini▼

Which is better, Claude Opus 5.5 or GPT 4o Mini?

▼

Both Claude Opus 5.5 and GPT 4o 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 Opus 5.5 or GPT 4o Mini?

▼

GPT 4o Mini has a lower blended cost. Claude Opus 5.5: $4.00 input / $20.00 output. GPT 4o Mini: $0.15 input / $0.60 output.

Which has a larger context window, Claude Opus 5.5 or GPT 4o Mini?

▼

Claude Opus 5.5 has a larger context window: Claude Opus 5.5 supports 1M tokens vs GPT 4o Mini at 128K tokens.

Do both Claude Opus 5.5 and GPT 4o Mini support vision?

▼

Yes, both Claude Opus 5.5 and GPT 4o Mini support vision/image input.

What are the key differences between Claude Opus 5.5 and GPT 4o Mini?

▼

Key differences: GPT 4o Mini is significantly cheaper; only Claude Opus 5.5 offers extended reasoning mode. 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 Opus 5.5 and GPT 4o Mini for free on idapt.app to see which performs better for your specific needs.

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