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GPT 4o Mini vs Claude Opus 5.5

At a glance

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

61128K ctx$0.15/$0.60 per M#69/92

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
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—
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%
Specs
128K
Context
16K
Max output
Jul 2024
Released
1M
Context
128K
Max output
Sep 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input96%$0.15/M tokens
Output97%$0.60/M tokens
Cache read63%$0.07/M tokens
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 4o MiniGo to model
Chat with Claude Opus 5.5Go to model
Frequently Asked Questions: GPT 4o Mini vs Claude Opus 5.5▼

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

▼

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

▼

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

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

▼

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

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

▼

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

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

▼

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 GPT 4o Mini and Claude Opus 5.5 for free on idapt.app to see which performs better for your specific needs.

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