OpenAI: GPT-5.1 vs OpenAI: GPT-6 Astra
OpenAI: GPT-5.1 is cheaper than OpenAI: GPT-6 Astra by about 83% on a blended (75% input / 25% output) basis. OpenAI: GPT-5.1 charges $1.250000 / $10.000000 per 1M input/output tokens; OpenAI: GPT-6 Astra charges $10.000000 / $50.000000.
| Field | OpenAI: GPT-5.1 | OpenAI: GPT-6 Astra |
|---|---|---|
| Input $/Mtok | $1.250000 | $10.000000 |
| Output $/Mtok | $10.000000 | $50.000000 |
| Cache read $/Mtok | $0.125000 | $1.000000 |
| Cache write $/Mtok | – | $12.500000 |
| Input $/Mchar | 0.352142 | 2.817139 |
| Output $/Mchar | 2.817139 | 14.085697 |
| Context window | 400000 | 1050000 |
| Tokenizer | o200k | o200k |
Price history
Same workload, monthly cost
Illustrative monthly cost at 10M tokens/month, split per workload preset. Not a substitute for the calculator, which uses your own volume, cache and batch assumptions.
| Workload | OpenAI: GPT-5.1 | OpenAI: GPT-6 Astra |
|---|---|---|
| Coding agent | $16.88 | $120.00 |
| RAG chat | $25.63 | $160.00 |
| Summarisation (batch) | $21.25 | $140.00 |
| Classification | $14.25 | $108.00 |
| Chat assistant | $47.50 | $260.00 |
| Content generation | $82.50 | $420.00 |
Cite this page
OpenAI: GPT-5.1 vs OpenAI: GPT-6 Astra: $1.250000/$10.000000 vs $10.000000/$50.000000 per 1M tokens, as of 2026-10-04 (Token Barometer, https://tokenbarometer.com/compare/openai_gpt-5.1-vs-openai_gpt-6-astra).
OpenAI: GPT-5.1 page | OpenAI: GPT-6 Astra page | Open in calculator