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Claude Opus 5.5 vs GPT 6 Astra Pro

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 GPT-6 Astra served in pro reasoning mode for the hardest problems.

1.1M ctx$10.00/$50.00 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
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Cheaper60%
Reasoning & Knowledge
Graduate Science90.6%Factual Recall72.2%
Math
Competition Math100.0%
Agentic
Novel Reasoning92.5%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—
Agentic
Novel Reasoning—
Specs
1M
Context
128K
Max output
Sep 2026
Released
1.1M
Context
128K
Max output
Sep 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input60%$4.00/M tokens
Output60%$20.00/M tokens
Cache read80%$0.20/M tokens
Cache write60%$5.00/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input$10.00/M tokens
Output$50.00/M tokens
Cache read$1.00/M tokens
Cache write$12.50/M tokens
Web search$0.01/search
Chat with Claude Opus 5.5Go to model
Chat with GPT 6 Astra ProGo to model
Frequently Asked Questions: Claude Opus 5.5 vs GPT 6 Astra Pro▼

Which is better, Claude Opus 5.5 or GPT 6 Astra Pro?

▼

Both Claude Opus 5.5 and GPT 6 Astra Pro 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 6 Astra Pro?

▼

Claude Opus 5.5 has a lower blended cost. Claude Opus 5.5: $4.00 input / $20.00 output. GPT 6 Astra Pro: $10.00 input / $50.00 output.

Which has a larger context window, Claude Opus 5.5 or GPT 6 Astra Pro?

▼

GPT 6 Astra Pro has a larger context window: Claude Opus 5.5 supports 1M tokens vs GPT 6 Astra Pro at 1.1M tokens.

Do both Claude Opus 5.5 and GPT 6 Astra Pro support vision?

▼

Yes, both Claude Opus 5.5 and GPT 6 Astra Pro support vision/image input.

What are the key differences between Claude Opus 5.5 and GPT 6 Astra Pro?

▼

Key differences: Claude Opus 5.5 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 Claude Opus 5.5 and GPT 6 Astra Pro for free on idapt.app to see which performs better for your specific needs.

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