OpenAI
CurrentGPT-6 Astra
OpenAI's most capable GPT-6 model, with a 1,050,000-token context window and 128,000 maximum output tokens.
OpenAI describes it as
“Our most capable model for the most demanding work.”
Last verified:
Key facts
- Context window
- 1,050,000
- Max output
- 128,000
- Input price
- $10.00
- Output price
- $50.00
- Max input
- 922,000
- Released
- Sep 3, 2026
- Knowledge cutoff
- Apr 30, 2026
- API model ID
- gpt-6-astra
tokens
tokens
$20.00 above 272K tokens
$75.00 above 272K tokens
tokens
First availability in the OpenAI API changelog ("Released GPT-6 Astra").
- OpenAI documents a 922,000-token maximum input alongside the 1,050,000-token context window.
About GPT-6 Astra
GPT-6 Astra is the highest-priced of the four flagship models in OpenAI's current catalog. OpenAI describes it as its most capable model for the most demanding work and recommends it for complex reasoning, coding, computer use, research and document creation. It takes text and image input, returns text, and exposes reasoning effort levels from low to max.
API pricing
Per-token API prices from the provider's pricing page. Thresholds and processing modes are shown explicitly, not folded into one number.
| Rate | Prompts up to 272,000 tokens | Prompts over 272,000 tokens |
|---|---|---|
| Input | $10.00 | $20.00 |
| Cached input | $1.00 | $2.00 |
| Output | $50.00 | $75.00 |
| Cache write (30 minutes) | $12.50 | $25.00 |
| Cache write (12 hours) | $25.00 | $50.00 |
| Rate | Prompts up to 272,000 tokens | Prompts over 272,000 tokens |
|---|---|---|
| Input | $5.00 | $10.00 |
| Cached input | $0.50 | $1.00 |
| Output | $25.00 | $37.50 |
| Rate | Prompts up to 272,000 tokens | Prompts over 272,000 tokens |
|---|---|---|
| Input | $20.00 | $40.00 |
| Cached input | $2.00 | $4.00 |
| Output | $100.00 | $150.00 |
| Rate | Prompts up to 272,000 tokens | Prompts over 272,000 tokens |
|---|---|---|
| Input | $60.00 | $120.00 |
| Cached input | $6.00 | $12.00 |
| Output | $300.00 | $450.00 |
- Flex processing is priced the same as Batch.
- Prompts above 272K input tokens are billed at 2x the input and cache rates and 1.5x the output rate for the whole request.
- Cache writes are billed at 1.25x the uncached input rate for 30-minute retention; 12-hour retention is twice that.
- Regional processing adds a 10% premium where available.
- OpenAI renamed Priority processing to Fast mode on July 30, 2026.
- Ultrafast is 6x Standard.
Modalities and capabilities
What the provider documents for this model. “API tool” means it needs a provider tool or endpoint rather than being native to the model.
- Input modalities
- Text, Image
- Output modalities
- Text
- ReasoningReasoning: ✓ Yes
reasoning.effort: low, medium, high, xhigh, max.
- Tool / function callingTool / function calling: ✓ Yes
- Structured outputsStructured outputs: ✓ Yes
- Web searchWeb search: ✓ Yes · API tool
Responses API web_search tool.
- Code executionCode execution: ✓ Yes · API tool
Responses API code_interpreter tool.
- Computer useComputer use: ✓ Yes · API tool
Responses API computer_use tool.
- Image generationImage generation: ✓ Yes · API tool
Through the image_generation tool; the model's own output is text.
- Prompt cachingPrompt caching: ✓ Yes
- Batch APIBatch API: ✓ Yes
Batch endpoint v1/batch.
Benchmarks
Individual named benchmarks only: there is no overall score. Vendor-reported results come from the model maker's own launch materials. Scores from different sources, versions or settings are not directly comparable.
No benchmark results are listed for this model yet.
Availability and API identifiers
| Surface | Identifier |
|---|---|
| OpenAI APIThe ID is both the alias and the only snapshot; OpenAI lists no dated snapshots. | gpt-6-astra |
| Responses API | v1/responses |
| Chat Completions API | v1/chat/completions |
| Batch API | v1/batch |
Limitations and caveats
API vs. apps. These limits and prices describe the OpenAI API model. ChatGPT and Codex can apply different limits and are billed through subscriptions, not per token.
- Fine-tuning is not supported for this model.
- OpenAI's model pages do not carry an explicit current/preview label; the model is listed in the catalog's flagship section and is not marked deprecated.
- OpenAI's launch page was not readable when this record was checked, so no vendor-reported benchmarks are listed.
Sources
Last verified against these sources on Oct 31, 2026. Prices and limits change; follow the links for the live figure.
- OpenAI API docs — GPT-6 Astra
Supports: knowledge cutoff, context window, max input, max output, modalities, capabilities, pricing
OfficialChecked Oct 31, 2026
- OpenAI API pricing
Supports: pricing
OfficialChecked Oct 31, 2026
- OpenAI API model catalog
Supports: status, modalities
OfficialChecked Oct 31, 2026
- OpenAI API changelog
Supports: release date
OfficialChecked Oct 31, 2026