How much does the GPT-6 Astra Pro API cost?

On FastMetal, GPT-6 Astra Pro is billed per token: $11.00 per 1M input tokens and $55.00 per 1M output tokens on a US-dollar account, before tax. Usage is drawn from a prepaid balance; there is no subscription or monthly fee.

Can I call GPT-6 Astra Pro with the OpenAI SDK?

Yes. Point base_url at https://api.fastmetal.ai/v1 and pass "gpt-6-astra-pro" as the model; existing OpenAI-style code works unchanged, including streaming, tool calls and structured output.

What is the context window of GPT-6 Astra Pro?

1,050,000 tokens, shared between the prompt and the response.

What do I need to try GPT-6 Astra Pro?

Create an account and add credit; the model is then available both in the browser chat and over the API. There is no contract or minimum spend.

Back to Models

OpenAI

gpt-6-astra-pro

GPT-6 Astra Pro

Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

9/4/2026

1,050,000 tokens

Input: $11.00/M

Output: $55.00/M

Try in Chat Get API Key

Specifications

Modalities

Input

file

image

text

Output

text

Supported Parameters

include_reasoning

max_completion_tokens

max_tokens

reasoning

reasoning_effort

response_format

seed

structured_outputs

tool_choice

tools

Max Output Tokens

128,000

Reasoning Configuration

Default: Thinking on (effort: medium)
Selectable effort levels: max
xhigh
high
medium
low
Turning thinking off: Not possible (always thinks)

How to control thinking, and what it costs

Data policy

Prompt retention: May be retained
Training: Not used for training

Whether a provider trains on prompts is a declared value from our terms with them. Retention is determined from the upstream listing for every host this model can reach. Neither is guessed.

Measured performance

Time to first response (p50)3.3s

Throughput (p50)10133 tokens/s

Measured through FastMetal's own gateway over the last 30 days (659 first-response samples).

Throughput is sampled once a day: the median of 27 observations over the last 30 days.

Time to first response is measured to the first streamed chunk; throughput counts all output tokens, including reasoning tokens. These are observations, not a performance guarantee.

Code Examples

curl https://api.fastmetal.ai/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "gpt-6-astra-pro",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Frequently asked questions

How much does the GPT-6 Astra Pro API cost?: On FastMetal, GPT-6 Astra Pro is billed per token: $11.00 per 1M input tokens and $55.00 per 1M output tokens on a US-dollar account, before tax. Usage is drawn from a prepaid balance; there is no subscription or monthly fee.
Can I call GPT-6 Astra Pro with the OpenAI SDK?: Yes. Point base_url at https://api.fastmetal.ai/v1 and pass "gpt-6-astra-pro" as the model; existing OpenAI-style code works unchanged, including streaming, tool calls and structured output.
What is the context window of GPT-6 Astra Pro?: 1,050,000 tokens, shared between the prompt and the response.
What do I need to try GPT-6 Astra Pro?: Create an account and add credit; the model is then available both in the browser chat and over the API. There is no contract or minimum spend.