OpenAI · Released Sep 4, 2026GPT-6 Astra (Fast)
Fast variant of GPT-6 Astra for low-latency assistance and high-volume workloads.
- Capability
- —No ECI score yet
- Input
- $20.00per 1M tokens
- Output
- $100.00per 1M tokens
- Context
- 1.05M128K max output
What it costs
- Input
- $20.00per million tokens
- Output
- $100.00per million tokens
- Blended (3:1)
- $40.00pricier than 98% of priced models
Typical monthly bills
| Monthly usage | Estimated cost |
|---|---|
| Side project2M input + 0.5M output tokens | $90.00 |
| Team assistant25M input + 5M output tokens | $1,000 |
| Production app250M input + 50M output tokens | $10,000 |
Median of 1 paid API provider on models.dev.
Independent benchmarks
Epoch AI has not published a Capabilities Index score for GPT-6 Astra (Fast) yet.
The details
- Lab
- OpenAI
- Released
- Sep 4, 2026
- Context window
- 1,050,000 tokens
- Max output
- 128,000 tokens
- Inputs
- Text, Images, PDFs
- Output
- Text
- Reasoning
- Always on
- Tool calling
- Yes
- Structured output
- Yes
- Weights
- Proprietary
- Availability
- 1 API providerlisted on models.dev
More from OpenAI
About GPT-6 Astra (Fast)
How much does GPT-6 Astra (Fast) cost?
GPT-6 Astra (Fast) costs $20.00 input / $100.00 output per million tokens (median across 1 API provider). At a 3:1 input-to-output mix that is $40.00 per million tokens, more expensive than 98% of the 360 priced models we track.
What is the context window of GPT-6 Astra (Fast)?
GPT-6 Astra (Fast) accepts up to 1,050,000 tokens per request and can write up to 128,000 tokens in one response.
How good is GPT-6 Astra (Fast)?
Epoch AI has not published a Capabilities Index score for GPT-6 Astra (Fast) yet.
Is GPT-6 Astra (Fast) open source?
No. GPT-6 Astra (Fast) is proprietary; you use it through an API or partner platforms.
What inputs does GPT-6 Astra (Fast) support?
GPT-6 Astra (Fast) accepts text, images and PDFs and replies in text. It is a reasoning model, supports tool calling and can return structured JSON output.
When was GPT-6 Astra (Fast) released?
OpenAI released GPT-6 Astra (Fast) on Sep 4, 2026.
What are the best alternatives to GPT-6 Astra (Fast)?
The closest current models from other labs on capability, price and release date are Claude Mythos 5 (Anthropic, $10.00 / $50.00), Kimi K2.8 Preview (Moonshot AI), MiniMax-M3.1-Flash-Preview (MiniMax) and MAI-Code-1.1-Flash (Microsoft).