GPT-6 Astra vs Claude Opus 5.5: Which AI Model is Better?
Head-to-head comparison of GPT-6 Astra and Claude Opus 5.5: current pricing, context windows, and capabilities.
Last updated: September 2026
Pricing Comparison
| Model | Provider | Input $/1M | Output $/1M | Context | Max Output |
|---|---|---|---|---|---|
| GPT-6 Astra | OpenAI | $10 | $50 | 1.05M | 128K |
| Claude Opus 5.5 | Anthropic | $4 | $20 | 1M | 128K |
Detailed Comparison
GPT-6 Astra
OpenAI
$10 / $50
per 1M tokens
Strengths
- + Excellent reasoning and multi-step tasks
- + Native vision and function calling
- + 1.05M context window
Best For
Multi-modal applications, complex reasoning chains
Context Window
1.05M
Max Output
128K
Claude Opus 5.5
Anthropic
$4 / $20
per 1M tokens
Strengths
- + Superior creative writing
- + Better at following nuanced instructions
- + Extended thinking for deep analysis
Best For
Long-form generation, nuanced analysis, creative tasks
Context Window
1M
Max Output
128K
Verdict
Claude Opus 5.5 costs 60% less per input and output token than GPT-6 Astra at short-context Standard rates. Astra must deliver at least 2.5x more value per token mix to offset that gap; choose with workload-specific evals.
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FAQ
Which is cheaper, GPT-6 Astra or Claude Opus 5.5?
GPT-6 Astra costs $10/$50 per million tokens (input/output), while Claude Opus 5.5 costs $4/$20. Claude Opus 5.5 is cheaper for input.
Which has a larger context window?
GPT-6 Astra supports 1.05M context, while Claude Opus 5.5 supports 1M. Larger context windows allow processing more text in a single request.
Which should I choose for my project?
Claude Opus 5.5 costs 60% less per input and output token than GPT-6 Astra at short-context Standard rates. Astra must deliver at least 2.5x more value per token mix to offset that gap; choose with workload-specific evals.