GPT-6 Astra — API Pricing & Benchmarks
GPT-6 Astra is OpenAI's flagship reasoning model, released in 2026-09. The API costs $10.0 per 1M input tokens and $50.0 per 1M output tokens ($20.0 blended at a 3:1 ratio), with cached input at $1.00. It supports a 1.1M-token context window. On the independently measured Artificial Analysis Intelligence Index it scores 52.7, ranking #3 of 72 models tracked on this site, with a median output speed of 58 tokens/sec.
Explore provider routes and additional benchmark sources for GPT-6 Astra
| Provider | OpenAI |
| Input price / 1M tokens | $10.0 |
| Output price / 1M tokens | $50.0 |
| Cached input / 1M tokens | $1.00 |
| Blended price (3:1) | $20.0 |
| Context window | 1.1M |
| Max output tokens | 128K |
| Knowledge cutoff | 2026-04 |
| License | proprietary |
| Input modalities | T+I |
| Output speed (tok/s) | 58 |
| Released | 2026-09 |
| Artificial Analysis Intelligence Index | 52.7 |
| LMArena Elo | 1444 |
| GPQA Diamond | 96.1% |
| Humanity's Last Exam | 54.7% |
Where GPT-6 Astra fits
On a blended 3:1 basis GPT-6 Astra costs $20.0 per 1M tokens, cheaper than 2% of the 84 priced models in this index. As OpenAI's flagship it is aimed at the hardest workloads — complex reasoning, agentic coding and multi-step tool use — where output quality dominates cost. Measured output speed of 58 tokens/sec is below the index median of 107 — typical of reasoning-heavy models, and worth checking against interactive latency budgets. Cached input is priced at $1.00 (90% below standard input), which rewards prompt structures with long stable prefixes — see our caching guide.
Price history
| Period | Input $/1M | Output $/1M | Cached $/1M |
|---|---|---|---|
| 2026-09-03 → current | $10.0 | $50.0 | $1.00 |
No list-price changes recorded since tracking began. Full dataset: price-history.json (CC BY 4.0).
Alternatives at a similar price
- Claude Fable 5.1 (Anthropic) — $20.0/1M blended, AA Index 53.4
- Claude Fable 5 (Anthropic) — $20.0/1M blended, AA Index 49.6
- GPT-5.5 (OpenAI) — $11.3/1M blended, AA Index 38.4
- Claude Opus 5 (Anthropic) — $10.0/1M blended, AA Index 50.8
Compare GPT-6 Astra
About OpenAI
OpenAI builds the GPT series. The GPT-6 generation (September 2026) ships in three sizes — Astra (flagship, $10/$50), Sol ($2/$10) and Luna ($0.10/$0.50) — that share a 1.05M-token context window and the same tooling, so teams can move workloads between price points without changing integration code. The GPT-5.6 models remain on sale as the previous generation.