GPT-6 Astra
openai/gpt-6-astraGPT-6 Astra is OpenAI's flagship GPT-6 reasoning model, described by OpenAI as its most capable model for the most demanding work, with text and image input. OpenAI recommends it for complex reasoning, coding, computer use, research and document creation, including multi-step workflows across code, browsers and professional software. It is the top tier above GPT-6.1 Sol and GPT-6 Luna; choose it when quality matters most, or the Astra Pro variant for the hardest requests.
- Input price
- $9.00
$10.00USD / 1M tokens - Output price
- $45.00
$50.00USD / 1M tokens - Context window
- 1.1M
- Max output
- 128K
Try the model
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Model card
Specifications
Pricing
- Input
- $9 / 1M tokens
- Output
- $45 / 1M tokens
- Cache read
- $0.90 / 1M tokens
- Cache write
- $11.25 / 1M tokens
Context & modalities
- Context window
- 1,050,000 tokens
- Max output
- 128,000 tokens
- Input
- Text, image
- Output
- Text
Capabilities
- Chat
- Supported
- Vision
- Supported
- Reasoning
- Supported
- Structured output
- Supported
- Function calling
- Supported
- Audio input
- Not supported
Access
- Provider
- OpenAI
- Model ID
- openai/gpt-6-astra
- Execution
- sync
- Base URL
- https://api.sandbase.ai
- API
- Responses API
- Endpoint
- /v1/responses
- API
- Chat Completions API
- Endpoint
- /v1/chat/completions
Independent evaluations
Benchmarks
Scores on standardized evaluations, compared with other models on SandBase.
Metrics sourced from Artificial Analysis · Intelligence Index v4.3
Start building
Send your first request
Choose either supported API with unified authentication and usage tracking.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/responses" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "openai/gpt-6-astra",
"input": "Hello",
"max_output_tokens": 2048
}
SANDBASE_JSON
)
printf '%s\n' "$result"Choose your model
Compare models
| Model | Context | Input / 1M | Output / 1M | Released |
|---|---|---|---|---|
GPT-6 AstraThis model OpenAI | 1.1M | $9.00 | $45.00 | Sep 4, 2026 |
OpenAI | 1.1M | $2.00 | $10.00 | Sep 29, 2026 |
OpenAI | 1.1M | $2.00 | $10.00 | Sep 29, 2026 |
OpenAI | 1.1M | $0.10 | $0.50 | Sep 22, 2026 |
OpenAI | 1.1M | $0.10 | $0.50 | Sep 22, 2026 |
OpenAI | 1.1M | $2.00 | $10.00 | Sep 22, 2026 |
Head to head:GPT-6 Astra vs Gemini 4 ArgonClaude Opus 5.5 vs GPT-6 Astra
Questions
FAQ
How do I call OpenAI GPT-6 Astra through SandBase?
Create a SandBase API key, then send requests with the model ID "openai/gpt-6-astra" to Responses API (/v1/responses) or Chat Completions API (/v1/chat/completions) at https://api.sandbase.ai. The request examples on this page show the exact payload.
How much does OpenAI GPT-6 Astra cost?
$9 per 1M input tokens and $45 per 1M output tokens with the current 10% discount (list price $10 / $50), billed per request from your SandBase balance.
What is the context window of OpenAI GPT-6 Astra?
1.1M tokens of context, with up to 128K output tokens per response.
How does OpenAI GPT-6 Astra score on benchmarks?
OpenAI GPT-6 Astra scores 52.7 on the Artificial Analysis Intelligence Index (v4.3), ranking #4 of 87 models on SandBase; Coding Index 76.9, Agentic Index 51.0. Source: Artificial Analysis, measured as GPT-6 Astra (Max).
Which features does OpenAI GPT-6 Astra support?
OpenAI GPT-6 Astra supports vision (image input), reasoning, function calling, structured output. See Specifications above for the full list.
Do I need a separate OpenAI account?
No. One SandBase API key and balance gives you access to OpenAI GPT-6 Astra and the other models in the catalog; you do not need to sign up with OpenAI separately.