GPT-6 Astra API pricing
Official OpenAI list price, last checked Oct 29, 2026. Updated Oct 29, 2026.
GPT-6 Astra costs $10 per 1M input tokens and $50 per 1M output tokens, cached input at $1, and a 1M-token context window, per OpenAI's official pricing page (checked Oct 29, 2026). It's a premium-priced model: number 76 of 77 by blended price ($20 per 1M tokens at a 3 to 1 input to output mix). On LMArena's Code Arena it ranks #2 of 50 models we price (relative score 87 out of 100). Cheaper pick: Claude Sonnet 5.5 scores 85 against 87 on the same board at $4 blended, 5.0x less.
GPT-6 Astra price per million tokens
| GPT-6 Astra price per million tokens | USD |
|---|---|
| Input | $10 |
| Cached input | $1 |
| Output | $50 |
| Blended, 3 parts input to 1 part output | $20 |
| Context window | 1M tokens |
| Prompts above 272K | $20 in, $75 out |
Official note from OpenAI: Prompts up to 272K. Longer prompts cost $20 in, $75 out.
What GPT-6 Astra costs for real work
List-price estimates for a month, no discounts. Our math, not a quote: change the token counts in the plan vs API calculator.
| Workload | Tokens a month | GPT-6 Astra | Claude Fable 5.1 | Claude Opus 5.5 |
|---|---|---|---|---|
| Light: a side project or personal assistant | 2M in, 0.5M out | $45.00 | $45.00 | $18.00 |
| Medium: a small team or one product feature | 20M in, 5M out | $450 | $450 | $180 |
| Heavy: a production app | 200M in, 50M out | $4,500 | $4,500 | $1,800 |
| Medium with 80% of input cached | 20M in (16M cached), 5M out | $306 | $294 | $119 |
| Medium, every prompt above the long-prompt threshold | 20M in, 5M out | $775 | $450 | $180 |
How GPT-6 Astra ranks on LMArena
Relative score: 100 is the top model we price on that board. Rank is among the models in our price table, not the full leaderboard.
| Board | Rank | Score /100 |
|---|---|---|
| Coding (Code Arena) | #2 of 50 | 87 |
| Chat (Text Arena) | #19 of 51 | 16 |
| Creative writing (Text Arena creative writing) | #17 of 51 | 6 |
| Roleplay and characters (Text Arena multi-turn) | #13 of 51 | 13 |
| Reasoning and math (Text Arena math) | #18 of 51 | 25 |
| Vision (Vision Arena) | #10 of 33 | 66 |
| Long documents (Document Arena) | #6 of 11 | 78 |
| Cheap bulk and agents (Agent Arena) | #4 of 34 | 79 |
Closest rivals to GPT-6 Astra
The models nearest in price, other makers first. Ranks are on Code Arena, where we have them.
| Model | In / out | Blended | Verdict |
|---|---|---|---|
| Claude Fable 5.1 | $10 / $50 | $20 | GPT-6 Astra wins: same price, higher score. Compare |
| Claude Opus 5.5 | $4 / $20 | $8 | Claude Opus 5.5 wins on both. Compare |
| Muse Wonder 1.0 | $4 / $20 | $8 | Muse Wonder 1.0 for price, GPT-6 Astra for quality. Compare |
| Kimi K3.1 Pro Highspeed | $4 / $20 | $8 | Kimi K3.1 Pro Highspeed wins on price. Compare |
Cheaper alternatives to GPT-6 Astra
At least 40% cheaper blended, best LMArena score first.
| Model | In / out | Blended | Verdict |
|---|---|---|---|
| Claude Opus 5.5 | $4 / $20 | $8 | Claude Opus 5.5 wins on both. Compare |
| Claude Sonnet 5.5 | $2 / $10 | $4 | Claude Sonnet 5.5 for price, GPT-6 Astra for quality. Compare |
| GPT-6.1 Sol | $2 / $10 | $4 | GPT-6.1 Sol for price, GPT-6 Astra for quality. Compare |
More from OpenAI
- GPT-5.5$5 in, $30 out per 1M
- GPT-5.6 Sol$4 in, $20 out per 1M
- GPT-5.6 Terra$2 in, $12 out per 1M
- GPT-6.1 Sol$2 in, $10 out per 1M
- GPT-6 Sol$2 in, $10 out per 1M
FAQ
How much does the GPT-6 Astra API cost per million tokens?
$10 per 1M input tokens and $50 per 1M output tokens, plus $1 per 1M for cached input, as of Oct 29, 2026. A typical 3 to 1 input to output mix works out to $20 per 1M tokens.
Does GPT-6 Astra charge more for long prompts?
Yes. Prompts above 272K: $20 in, $75 out.
Is GPT-6 Astra cheaper than Claude Fable 5.1?
About the same. A medium month (20M input and 5M output tokens) costs $450 on GPT-6 Astra and $450 on Claude Fable 5.1 at list price. On Code Arena, GPT-6 Astra ranks #2 and Claude Fable 5.1 #5.
How does GPT-6 Astra rank on LMArena?
On Code Arena it is #2 of 50 models we price, with a relative score of 87 out of 100. It ranks on 8 of 8 boards we track.
What is a cheaper alternative to GPT-6 Astra?
Claude Opus 5.5 costs $4 in and $20 out per 1M tokens, about 2.5x less blended, and scores 100 on Code Arena against 87 for GPT-6 Astra.
Where does this GPT-6 Astra price come from?
From OpenAI's official pricing page, which we check every day. This page was last checked Oct 29, 2026.