GPT-6 Astra vs Claude Opus 5: price and context compared
OpenAI's GPT-6 Astra and Anthropic's Claude Opus 5 sit at similar price points but differ in context window size and cost structure.
Update (9 Nov 2026): Claude Fable 5.2 and Mythos 5.2 are out - prices, access and benchmarks are in my Claude Fable 5.2 guide.
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GPT-6 Astra and Claude Opus 5 represent the two flagship offerings in the current large language model landscape, but they take different approaches to pricing and capability. Released on September 3rd 2026, GPT-6 Astra charges $10 per million input tokens and $50 per million output tokens. Claude Opus 5 costs exactly half that: $5 per million input tokens and $25 per million output tokens.
The context window comparison is tighter. GPT-6 Astra offers 1,050,000 tokens of context, while Claude Opus 5 provides 1,000,000 tokens. That 50,000-token difference represents about 5 percent more capacity, enough to fit an additional short novel or several dozen additional documents in a single prompt.
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For projects where cost is the primary constraint, Claude Opus 5 delivers the same million-token context window at half the price. A workflow that processes 50 million input tokens and generates 10 million output tokens monthly costs $1,000 on GPT-6 Astra but only $500 on Claude Opus 5.
The extra 50,000 tokens of context in GPT-6 Astra matters most for applications that routinely bump against context limits. If your workflow involves analyzing entire codebases, processing multiple lengthy documents simultaneously, or maintaining very long conversation histories, that additional capacity can eliminate the need for chunking or summarization steps.
For most use cases, Claude Opus 5 offers better value with its lower pricing and nearly identical context window. GPT-6 Astra makes sense when you specifically need that extra context capacity or when other factors beyond pricing and context window inform your decision. The doubled cost means you should have a clear reason for choosing it over Claude Opus 5.
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benchmarks·GPT-6 Astra cost analysis: what you’ll actually payBreaking down GPT-6 Astra's $10/$50 per million token pricing against Claude Opus 5, Kimi K3, and Grok 4.6 for real workloads.