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Claude Opus 4.8 vs GPT OSS 20B

At a glance

Anthropic's most capable Opus yet, built for long-horizon autonomous agents and frontier coding.

891M ctx$5.00/$25.00 per M#4/92

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

131K ctx$0.03/$0.13 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
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·Provider·OpenRouter· as of 2026-07-10
Capability
CapabilityECI89.2
Reasoning & Knowledge
Graduate Science91.0%Factual Recall39.5%
Math
Competition Math98.3%Research Math47.2%
Coding
Real-World Coding88.6%
Agentic
Terminal Tasks—Novel Reasoning72.1%
Reasoning
CodingInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-07-10
Cheaper99%
Capability
Capability—
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—Research Math—
Coding
Real-World Coding—
Agentic
Terminal Tasks3.4%Novel Reasoning—
Specs
1M
Context
128K
Max output
May 2026
Released
131K
Context
66K
Max output
Aug 2025
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$5.00/M tokens
Output$25.00/M tokens
Cache read$0.50/M tokens
Cache write$6.25/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input99%$0.03/M tokens
Output99%$0.13/M tokens
Cache read94%$0.03/M tokens
Chat with Claude Opus 4.8Go to model
Chat with GPT OSS 20BGo to model
Frequently Asked Questions: Claude Opus 4.8 vs GPT OSS 20B▼

Which is better, Claude Opus 4.8 or GPT OSS 20B?

▼

Both Claude Opus 4.8 and GPT OSS 20B 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 4.8 or GPT OSS 20B?

▼

GPT OSS 20B has a lower blended cost. Claude Opus 4.8: $5.00 input / $25.00 output. GPT OSS 20B: $0.03 input / $0.13 output.

Which has a larger context window, Claude Opus 4.8 or GPT OSS 20B?

▼

Claude Opus 4.8 has a larger context window: Claude Opus 4.8 supports 1M tokens vs GPT OSS 20B at 131K tokens.

Do both Claude Opus 4.8 and GPT OSS 20B support vision?

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Claude Opus 4.8 supports vision/image input, but GPT OSS 20B does not.

What are the key differences between Claude Opus 4.8 and GPT OSS 20B?

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Key differences: GPT OSS 20B is significantly cheaper; only Claude Opus 4.8 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 Claude Opus 4.8 and GPT OSS 20B for free on idapt.app to see which performs better for your specific needs.

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