GPT-5 vs GPT-5.1
GPT-5 and GPT-5.1 are priced within 0.5% of each other on a blended (75% input / 25% output) basis. GPT-5 charges $1.25 / $10.00 per 1M input/output tokens; GPT-5.1 charges $1.25 / $10.00.
| Field | GPT-5 | GPT-5.1 |
|---|---|---|
| Input $/Mtok | $1.25 | $1.25 |
| Output $/Mtok | $10.00 | $10.00 |
| Cache read $/Mtok | $0.13 | $0.13 |
| Cache write $/Mtok | – | – |
| Input $/Mchar | 0.35 | 0.35 |
| Output $/Mchar | 2.82 | 2.82 |
| Context window | 400000 | 400000 |
| Tokenizer | o200k | o200k |
| Confidence? | aggregator | api |
| Source | litellm | openrouter |
Confidence: official = vendor pricing page · api = OpenRouter per-host · aggregator = community list, may lag · unreviewed = automatic extraction awaiting review. When sources disagree the most authoritative wins. Details: /methodology#confidence
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 | GPT-5 | GPT-5.1 |
|---|---|---|
| Coding agent | $16.88 | $16.88 |
| RAG chat | $25.63 | $25.63 |
| Summarisation (batch) | $21.25 | $21.25 |
| Classification | $14.25 | $14.25 |
| Chat assistant | $47.50 | $47.50 |
| Content generation | $82.50 | $82.50 |
Cite this page
GPT-5 vs GPT-5.1: $1.25/$10.00 vs $1.25/$10.00 per 1M tokens as of 2026-10-04. Token Barometer by Dejan Strbad, https://tokenbarometer.com, data CC BY 4.0. https://tokenbarometer.com/compare/openai_gpt-5-vs-openai_gpt-5.1