GPT-6 Astra vs Claude Opus 5.5: API pricing and agent cost
| Model | Provider | Input $/1M | Output $/1M | Cached $/1M | Per task | Per month |
|---|---|---|---|---|---|---|
| GPT-6 Astra | OpenAI | $10.0 | $50.0 | $1.0 | $0.3500 | $1,050.00 |
| Claude Opus 5.5 | Anthropic | $4 | $20 | $0.2 | $0.1400 | $420.00 |
For an agent making 5 tool calls per task (3,000 input and 800 output tokens per call) and running 100 tasks a day, Claude Opus 5.5 is the cheaper option at $420.00 a month, versus $1,050.00 for GPT-6 Astra (2.5× the cost).
This compares list prices only, not quality. Prompts with more than 272K input tokens are priced at 2x input and cache rates and 1.5x output for the full request (OpenAI model page). Derived long-context rate: $20 in / $2 cached / $75 out.
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