GPT-6 Astra Pro API Pricing & Monthly Cost Simulator
Verified 2026 unit economics for OpenAI GPT-6 Astra Pro (openai/gpt-6-astra-pro): $10/1M uncached input, $1/1M cached prefix read, and $50/1M output across a 1,050,000-token context window (released 2026-09-04).
Uncached Input (/1M)
$10
Cached Prompt Read (/1M)
$1 (-90%)
Output Completion (/1M)
$50
50% Batch API (In / Out)
$5 / $25
Interactive 30-Day Monthly Spend Simulator
Live Unit-Cost & Prompt Cache Slider (GPT-6 Astra Pro)
openai/gpt-6-astra-pro
Estimated 30-day spend
$1860.00/mo
Cost per 1,000 calls
$62.0000
Monthly savings vs 0% cache
$540.00/mo
Technical Limits & API Capabilities
Context window
1,050,000
Max output tokens
128,000
Workload tier
Frontier Reasoning
Input modalities
text, file, image
Tool Calling: Yes
JSON Schema Strict: Yes
Reasoning Tokens: Supported
50% Batch API: Available
Same-Category 2026 Model Alternatives (Frontier Reasoning)
| Model | Provider | Input / Cached ($/1M) | Output ($/1M) | Context / Max Out |
|---|---|---|---|---|
| GPT-6 Astra Pro | OpenAI | $10 / $1 | $50 | 1,050,000 / 128,000 |
| Claude Fable 5.2 | Anthropic | $8 / $0.2 | $40 | 1,000,000 / 128,000 |
| GLM 5.3 FlashX Legal | Z.ai / GLM | $0.37 / $0.075 | $1.25 | 1,048,576 / 131,072 |
| GPT-6.1 Terra Pro | OpenAI | $1 / $0.05 | $5 | 1,050,000 / 128,000 |
| Kimi K3.1 Pro | Moonshot | $2 / $0.2 | $10 | 1,048,576 / 943,718 |
| GPT-6.1 Sol Pro | OpenAI | $2 / $0.1 | $10 | 1,050,000 / 128,000 |
| Claude Sonnet 5.5 | Anthropic | $2 / $0.1 | $10 | 1,000,000 / 128,000 |
Head-to-Head Matchups Featuring GPT-6 Astra Pro
- GPT-6 Astra Pro vs GPT-6.1 Sol Pro — $10 vs $2 / 1M
Frequently Asked Questions
How much does GPT-6 Astra Pro cost per 1 million tokens in 2026?
GPT-6 Astra Pro by OpenAI is billed at $10 per 1M uncached input tokens, $1 per 1M cached input read tokens (90% cache discount), and $50 per 1M output tokens.
What are the context window and max output token limits for GPT-6 Astra Pro?
GPT-6 Astra Pro supports a 1,050,000-token input context window and up to 128,000 completion output tokens per request, accepting text, file, image inputs.
Does GPT-6 Astra Pro support strict JSON Schema outputs, tool calling, and Batch API?
GPT-6 Astra Pro capability profile: tool calling = Supported, strict JSON Schema structured outputs = Supported, reasoning mode = Supported, and 50% asynchronous Batch API = Supported.