GPT-6 Astra vs Claude Opus 5.5: API Pricing Compared
Official prices, verified 2026-10-24. Every conclusion on this page is computed from the price data — if the prices change, the verdict changes.
| GPT-6 Astra (OpenAI) | Claude Opus 5.5 (Anthropic) | |
|---|---|---|
| Input / 1M | $10 | $4 |
| Output / 1M | $50 | $20 |
| Cached input / 1M | $1 | $0.2 |
| Batch tier | Not published | $2 / $10 |
| Context window | 1,050,000 | 1,048,576 |
| Price verified | 2026-10-24 | 2026-10-24 |
Monthly cost at three workloads
| Workload | GPT-6 Astra | Claude Opus 5.5 |
|---|---|---|
| Chat assistant 2,000 input / 500 output tokens per call, 10,000 calls a month | $450.00 | $180.00 |
| Document processing 50,000 input / 2,000 output tokens per call, 1,000 calls a month | $600.00 | $240.00 |
| Agent loop with prompt caching 10,000 fresh input / 100,000 cached input / 2,000 output tokens per call, 500 calls a month | $150.00 | $50.00 |
The verdict, from the data
- Claude Opus 5.5 has cheaper input: $4 vs $10 per 1M tokens (60% less).
- Claude Opus 5.5 has cheaper output: $20 vs $50 per 1M tokens (60% less).
- At a blended workload of 1M input + 250K output tokens, Claude Opus 5.5 wins: $9.00 vs $22.50 per call batch.
- Only Claude Opus 5.5 publishes a batch tier ($2 / $10), which halves its rates for latency-tolerant work.
Run your own numbers in the homepage calculator, or open the dedicated calculators for GPT-6 Astra and Claude Opus 5.5.