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GPT OSS 20B vs Claude Haiku 5.5

At a glance

OpenAI's compact open-weights model for efficient inference.

131K ctx$0.02/$0.09 per M

Anthropic's fast, low-cost Claude Haiku for high-volume work, succeeding Claude Haiku 4.5.

1M ctx$0.10/$0.50 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
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Cheaper82%
Reasoning & Knowledge
Graduate Science60.8%
Math
Competition Math65.3%
Agentic
Terminal Tasks3.4%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Reasoning & Knowledge
Graduate Science—
Math
Competition Math—
Agentic
Terminal Tasks—
Specs
131K
Context
33K
Max output
Aug 2025
Released
1M
Context
128K
Max output
Oct 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input82%$0.02/M tokens
Output82%$0.09/M tokens
Cache read10%$0.009/M tokens
Live pricing, shown before you run
Input$0.10/M tokens
Output$0.50/M tokens
Cache read$0.01/M tokens
Cache write$0.13/M tokens
Web search$0.01/search
Chat with GPT OSS 20BGo to model
Chat with Claude Haiku 5.5Go to model
Frequently Asked Questions: GPT OSS 20B vs Claude Haiku 5.5▼

Which is better, GPT OSS 20B or Claude Haiku 5.5?

▼

Both GPT OSS 20B and Claude Haiku 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 OSS 20B or Claude Haiku 5.5?

▼

GPT OSS 20B has a lower blended cost. GPT OSS 20B: $0.02 input / $0.09 output. Claude Haiku 5.5: $0.10 input / $0.50 output.

Which has a larger context window, GPT OSS 20B or Claude Haiku 5.5?

▼

Claude Haiku 5.5 has a larger context window: GPT OSS 20B supports 131K tokens vs Claude Haiku 5.5 at 1M tokens.

Do both GPT OSS 20B and Claude Haiku 5.5 support vision?

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Claude Haiku 5.5 supports vision/image input, but GPT OSS 20B does not.

What are the key differences between GPT OSS 20B and Claude Haiku 5.5?

▼

Key differences: GPT OSS 20B is significantly cheaper; only Claude Haiku 5.5 supports vision input. 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 OSS 20B and Claude Haiku 5.5 for free on idapt.app to see which performs better for your specific needs.

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