How much does GPT-6 Astra API cost?

Standard text rates are $10 per 1M input tokens and $50 per 1M output tokens. Cached input is $1 per 1M. Batch and Flex are 50% of Standard; Fast is 2×.

Is there a free tier for gpt-6-astra?

No. OpenAI lists Free tier as not supported for this model.

Why is my bill higher than the calculator?

Tool calls, Fast mode, prompts over 272K input, and cache writes can raise cost. This tool estimates text tokens only.

ChatGPT Plus includes Astra API?

No. Subscription and API billing are separate.

Same 50% off. Batch = async batching; Flex = sync half-price with higher latency. Prefer Flex for agent evals / interactive flows where Batch won't fit.

Unofficial · Prices from OpenAI docs · Updated: 2026-09-05

GPT-6 Astra API Pricing Calculator

Paste your expected tokens. See Standard / Batch / Flex / Fast cost before you flip the model switch.

Calculate cost

How to access GPT-6 Astra

Can you use GPT-6 Astra today?

ChatGPT Plus/Pro/Business/Enterprise — check the model picker (rollout may lag).
API project has billing enabled (a ChatGPT subscription is not API credit).
Usage tier is at least Tier 1. Free API: not supported.
Prefer the Responses API for tools (web/file search, computer use, MCP…).

Official gpt-6-astra model page →

Quick facts

gpt-6-astra model id and published limits.

Model ID: gpt-6-astra
Context: 1,050,000
Max output: 128,000
Knowledge cutoff: Apr 30, 2026
Reasoning effort: low · medium · high · xhigh · max
Standard input: $10 / 1M
Cached input: $1 / 1M
Cache write: $12.50 / 1M
Standard output: $50 / 1M
Long context: >272K input → whole request reprice (not input-only)
Free tier: Not supported

GPT-6 Astra vs Sol vs Claude Fable 5.1

In / out per 1M tokens. Competitor rows are snapshots — confirm live before you cite.

Model	In / Out per 1M	Notes
GPT-6 Astra	$10 / $50	Free API tier unsupported
GPT-5.6 Sol (promo, verify)	~$4 / $20	Confirm live before you cite
Claude Fable 5.1	~$10 / $50	Often cited — verify Anthropic
Gemini 3.8 Flash	$0.75 / $3.75 intro	Thru 2026-12-31, then $1.50 / $7.50

Competitor prices change. We link out rather than scrape. For a live sortable table see the LLM Pricing Leaderboard.

FAQ

How much does GPT-6 Astra API cost?: Standard text rates are $10 per 1M input tokens and $50 per 1M output tokens. Cached input is $1 per 1M. Batch and Flex are 50% of Standard; Fast is 2×.
Is there a free tier for gpt-6-astra?: No. OpenAI lists Free tier as not supported for this model.
What’s the model id?: gpt-6-astra
Why is my bill higher than the calculator?: Tool calls, Fast mode, prompts over 272K input, and cache writes can raise cost. This tool estimates text tokens only.
ChatGPT Plus includes Astra API?: No. Subscription and API billing are separate.
Batch vs Flex?: Same 50% off. Batch = async batching; Flex = sync half-price with higher latency. Prefer Flex for agent evals / interactive flows where Batch won't fit.

Not affiliated with OpenAI. Calculator is an estimate. Always verify on the official pricing and model pages before production spend. Rates checked 2026-09-05.

Get a ping when frontier model prices change

Occasional emails when list prices move. No spam.

More ACG tools

Prices

LLM Pricing Leaderboard

Official list prices, sorted by value

Burn

Agent Burn Estimator

How much will your agents cost this month?

Prompt Cost

Prompt Cost Calculator

Paste a prompt, see the bill

MCP

Budget-Aware MCP Templates

Make coding agents budget-aware

Checklist

Agent Cost Runaway Checklist

12 signals your agents are burning money

GPT-6 Astra API Pricing Calculator