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All comparisons · Prices checked 2026-10-01
GPT-6 Astra vs Claude Opus 5.5: API cost comparison
For a typical chatbot reply, GPT-6 Astra costs $0.035 and Claude Opus 5.5 costs $0.018 per request: Claude Opus 5.5 is 1.9× cheaper. Claude Opus 5.5 is cheaper in every workload below.
API prices
| GPT-6 Astra | Claude Opus 5.5 | |
|---|---|---|
| Maker | OpenAI | Anthropic |
| Input / 1M tokens | $10 | $4 |
| Output / 1M tokens | $50 | $20 |
| Output vs input price | 5.0× | 5.0× |
| Context window | 922K tokens | 1M tokens |
| Tokens for the same English text | baseline (GPT o200k count) | ~130% of GPT's count (estimate) |
Cost by workload
| Workload (per 1,000 requests) | GPT-6 Astra | Claude Opus 5.5 | Cheaper |
|---|---|---|---|
| Chatbot reply short question plus some chat history · 1,500 in / 400 out | $35.00 | $18.20 | Claude Opus 5.5 1.9× cheaper |
| Document Q&A (RAG) retrieved passages plus a question · 8,000 in / 500 out | $105 | $54.60 | Claude Opus 5.5 1.9× cheaper |
| Coding agent step large working context, short edit · 25,000 in / 800 out | $290 | $151 | Claude Opus 5.5 1.9× cheaper |
| Summarize a long report long input, short summary · 20,000 in / 300 out | $215 | $112 | Claude Opus 5.5 1.9× cheaper |
| Write an article short brief, long draft · 800 in / 2,000 out | $108 | $56.16 | Claude Opus 5.5 1.9× cheaper |
Claude Opus 5.5 is cheaper on both input and output, so it costs less for every kind of request. The gap is 1.9× on input and 1.9× on output once the tokenizer difference is included.
Same text, different token counts. Each company uses its own tokenizer. By our estimate Claude Opus 5.5 counts about 30% more tokens than GPT-6 Astra for the same English text, and the costs above already include that. Paste your own prompt into the token counter to see both counts.
Monthly cost
| Monthly volume | GPT-6 Astra | Claude Opus 5.5 |
|---|---|---|
| 10,000 chatbot replies / month | $350 | $182 |
| 100,000 chatbot replies / month | $3,500 | $1,820 |
| 1,000,000 chatbot replies / month | $35,000 | $18,200 |
Calculate your own
Enter your typical request size and volume.
Token counts are for English text measured with GPT's tokenizer; each model's own tokenizer difference is applied automatically.
Questions
Which is cheaper, GPT-6 Astra or Claude Opus 5.5?
For a typical chatbot reply (1,500 input and 400 output tokens), GPT-6 Astra costs $0.035 and Claude Opus 5.5 costs $0.018 per request, so Claude Opus 5.5 is 1.9× cheaper. Claude Opus 5.5 is cheaper in every workload below.
How much do GPT-6 Astra and Claude Opus 5.5 cost per million tokens?
GPT-6 Astra costs $10 per 1M input tokens and $50 per 1M output tokens. Claude Opus 5.5 costs $4 input and $20 output. Prices checked 2026-10-01.
Do both models count the same text as the same number of tokens?
No. Each model family has its own tokenizer, so the same text can be a different number of tokens. The costs on this page already include that difference (estimated from GPT's tokenizer).
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Paste a real prompt to see its exact tokens and cost on GPT-6 Astra, Claude Opus 5.5 and 30+ other models.
Open the token counter →Standard API list prices, short-context tier, no caching or batch discounts. Prices change; check each provider's pricing page before large jobs.