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GPT 5 Mini vs Claude Opus 5.5

At a glance

Compact GPT-5 variant balancing speed and intelligence.

78400K ctx$0.25/$2.00 per M#33/92

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
Reasoning
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-10-02
Cheaper91%
Capability
CapabilityECI78.0
Reasoning & Knowledge
Graduate Science75.0%Factual Recall21.6%
Math
Math Problems97.8%Competition Math86.7%Research Math27.2%
Coding
Real-World Coding64.7%
Agentic
Terminal Tasks31.9%Novel Reasoning4.4%
Reasoning
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Capability
Capability—
Reasoning & Knowledge
Graduate Science21%90.6%Factual Recall234%72.2%
Math
Math Problems—Competition Math15%100.0%Research Math—
Coding
Real-World Coding—
Agentic
Terminal Tasks—Novel Reasoning1983%92.5%
Specs
400K
Context
128K
Max output
Aug 2025
Released
1M
Context
128K
Max output
Sep 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input94%$0.25/M tokens
Output90%$2.00/M tokens
Cache read88%$0.02/M tokens
Web search$0.01/search
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 5 MiniGo to model
Chat with Claude Opus 5.5Go to model
Frequently Asked Questions: GPT 5 Mini vs Claude Opus 5.5▼

Which is better, GPT 5 Mini or Claude Opus 5.5?

▼

Both GPT 5 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 5 Mini or Claude Opus 5.5?

▼

GPT 5 Mini has a lower blended cost. GPT 5 Mini: $0.25 input / $2.00 output. Claude Opus 5.5: $4.00 input / $20.00 output.

Which has a larger context window, GPT 5 Mini or Claude Opus 5.5?

▼

Claude Opus 5.5 has a larger context window: GPT 5 Mini supports 400K tokens vs Claude Opus 5.5 at 1M tokens.

Do both GPT 5 Mini and Claude Opus 5.5 support vision?

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Yes, both GPT 5 Mini and Claude Opus 5.5 support vision/image input.

What are the key differences between GPT 5 Mini and Claude Opus 5.5?

▼

Key differences: GPT 5 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 GPT 5 Mini and Claude Opus 5.5 for free on idapt.app to see which performs better for your specific needs.

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