GPT-6 Astra Pro
by OpenAI · openai/gpt-6-astra-pro · #407 cheapest of 422 paid models
Prices updated Sep 19, 2026, 6:22 PM UTC · refreshed hourly
GPT-6 Astra Pro is the same underlying model as [GPT-6 Astra](https://openrouter.ai/openai/gpt-6-astra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode
Compare vs:Claude Sonnet 5Claude Opus 4.6Claude Haiku 4.5Gemini 3.6 Flash
Pricing
Input
$10.00
per 1M tokens
Output
$50.00
per 1M tokens
Blended (3:1)
$20.00
3 input : 1 output
Cache read
$1.00
per 1M cached tokens
Cache write
$12.50
per 1M tokens
Cache & batch economics
Effective prices for GPT-6 Astra Pro with prompt caching.
| Cache hit rate | Effective blended $/1M | Example request* | vs no cache |
|---|---|---|---|
| 0% | $20.00 | $1.07 | — |
| 50% | $16.63 | $0.62 | −42% |
| 90% | $13.93 | $0.26 | −76% |
*Example: 100K sticky context + 2K new input + 1K output. Batch discount is an approximate 50% off list rates for this provider’s batch API. Confirm on the vendor’s pricing page.
What a request costs
| Workload | Input tokens | Output tokens | Cost / request | Cost / 1K requests |
|---|---|---|---|---|
| Short chat message | 500 | 300 | $0.02 | $20.00 |
| Document summary | 8,000 | 1,000 | $0.13 | $130.00 |
| Codebase question (RAG) | 30,000 | 2,000 | $0.4 | $400.00 |
| Long-context analysis | 150,000 | 5,000 | $1.75 | $1,750 |
Specs
Context window
1.05M
tokens
Max output
128K
tokens
Input modalities
file, image, text
Tokenizer
GPT