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Is Claude Opus 5.5 cheaper than GPT-6 Astra?
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Compare our Q2 actuals against budget and flag lines more than 10% off.
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GPT-6 Astra for deep thinking on complex tasks.
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Qwen3.6 35B-A3B
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GPT-6 Astra
GPT-5.6 Sol
GPT-5.6 Terra
Claude Fable 5.1
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Claude Sonnet 5
GLM 5.3
Kimi K3
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GPT-6.1 Sol
GPT-6 Astra
Claude Opus 5.5
Claude Sonnet 5
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Is Claude Opus 5.5 cheaper than GPT-6 Astra?
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Is Claude Opus 5.5 cheaper than GPT-6 Astra?
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Reading the Anthropic and OpenAI pricing pages
Comparing input and output prices per million tokens

Yes. Claude Opus 5.5 costs 60% less than GPT-6 Astra for both input and output tokens, though GPT-6.1 Sol is cheaper than either.anthropic+2

API price per 1M tokens

ModelInputOutputReleased
Claude Opus 5.5$4$20Sep 22, 2026 anthropic
GPT-6 Astra$10$50Sep 3, 2026 datacamp+1

When the cheaper model is worth it

  • Sonnet 5.5 scores 70.6% on Terminal-Bench 4.0, higher than Opus 5.5, at $2 / $10.anthropic+1
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Review my tax returns and brokerage statements from 2018 on and flag the holdings that cost the most.
PDFTax_Returns_2018_2025.pdf
PDFExecutive_Review.pdf

Advisory fees were the largest drag on returns in 2023.Tax_Returns_2018_2025.pdf

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Is Claude Opus 5.5 cheaper than GPT-6 Astra?
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