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OpenAI · 3 current models

GPT-6 API pricing

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OpenAI's current generation, released in September 2026 in three sizes: Astra ($10 / $50), Sol ($2 / $10) and Luna ($0.10 / $0.50) per 1M tokens, all with a 1.05M-token context window.

GPT-6 Astra

New 3 Sep
Input
$10.00
per 1M tokens
Output
$50.00
per 1M tokens
Cached input
$1.00
90% off input
Batch
50% off
for jobs that can wait
Context window
1.05M
tokens
Verified 27 Sep 2026OpenAI pricing

What it costs in practice

GPT-6 Astra at list prices, no batch discount.

1,000 chat replies1,500 tokens in and 300 out each$30.00
Summarising 100 long reports20,000 tokens in and 800 out each$24.00
A month of a coding agent400 tasks, 85% of input cached$2,163

The coding-agent example assumes 85% of input is served from cache, typical for agents that resend the same context each step. Model your own workload

Details

API model IDgpt-6-astra
Released3 Sep 2026
Long promptsPrompts over 272K tokens: 2× input, 1.5× output
Arena text score1478 (25 Sep)
Intelligence Index53 (Artificial Analysis, 27 Sep)
StatusCurrent
  • Broadly available from 4 September 2026.

Checked 27 Sep 2026 against OpenAI pricing and OpenAI model page .

Other GPT-6 models

Prompts longer than 272K tokens are billed at 2× input and 1.5× output.

Model Input / 1M Output / 1M Cached input Context Released
GPT-6 Sol
 $2.00 $10.00 $0.20 1.05M 22 Sep 2026
GPT-6 Luna
 $0.10 $0.50 $0.010 1.05M 22 Sep 2026

Version details

GPT-6 Sol

New 22 Sep

$2.00 / $10.00 per 1M tokenscached $0.20 · batch 50% off · 1.05M context

Released 22 Sep 2026 · gpt-6-sol · Prompts over 272K tokens: 2× input, 1.5× output

Checked 27 Sep 2026 against OpenAI pricing and OpenAI model page .

GPT-6 Luna

New 22 Sep

$0.10 / $0.50 per 1M tokenscached $0.010 · batch 50% off · 1.05M context

Released 22 Sep 2026 · gpt-6-luna · Prompts over 272K tokens: 2× input, 1.5× output

Checked 27 Sep 2026 against OpenAI pricing .

Compare GPT-6 Astra

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Price history

All changes
  • OpenAI
    OpenAI launched GPT-6 Sol at $2 / $10 and GPT-6 Luna at $0.10 / $0.50. Source
  • OpenAI
    OpenAI launched GPT-6 Astra at $10 / $50, its most expensive standard model. Source

OpenAI pricing rules

  • Batch and Flex processing cost 50% less.
  • For GPT-5.4 and later, prompts longer than 272K tokens are billed at 2× the input price and 1.5× the output price.
  • Cached input is billed at about a tenth of the input price.

All OpenAI models

Questions

How much does GPT-6 Astra cost?

As of 27 Sep 2026, GPT-6 Astra costs $10 per million input tokens and $50 per million output tokens, and $1 per million cached input tokens. Batch requests cost 50% less. Prices checked 27 Sep 2026.

What is the cheapest GPT-6 model?

GPT-6 Luna, at $0.10 / $0.50 per million input / output tokens.

What is GPT-6 Astra's context window?

1.05M tokens.

Does GPT-6 Astra support prompt caching?

Yes. Repeated input read from the cache costs $1 per million tokens, 90% less than normal input.