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News · OpenAI · September 22, 2026

Published . By , AI-assisted.

GPT-6 Sol and Luna are out: half the API price, and what they cost you

OpenAI released GPT-6 Sol and GPT-6 Luna on September 22, 2026 at API prices it calls 50% cheaper than before: Sol is $2 per million input tokens and $10 per million output, Luna $0.10 and $0.50. GPT-6 Sol has been in llmwise since September 25, 2026: up to 125 GPT-6 Sol messages a month on Pro ($20).

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Facts checked against OpenAI: Introducing GPT-6 Sol and Luna, OpenAI News, which lists the post under September 22, 2026, OpenAI API docs: GPT-6 Sol. Updated .

What OpenAI announced

Each point is from OpenAI's own announcement unless its source says otherwise; the numbers link to the sources below.

  1. OpenAI trained Sol and Luna with methods like those behind GPT-6 Astra, which it released earlier in September and still calls its best model across the board.[1]

  2. Sol went from $4 to $2 per million input tokens and from $20 to $10 per million output; Luna from $0.20 to $0.10 in and from $1.20 to $0.50 out. OpenAI calls that 50% cheaper than the previous generation's promotional prices.[1]

  3. Sol's context window is 1,050,000 tokens and a reply can run to 128,000 tokens; prompts over 272K input tokens are billed at twice the input rate and 1.5 times the output rate.[3]

  4. OpenAI says better prompt caching for GPT-6 gives a 90% discount on cached input-token reads.[1]

  5. In ChatGPT, both rolled out in ChatGPT Work and Codex for Plus, Pro, Business, Enterprise and Edu users; OpenAI said they weren't yet available in Chat.[1]

  6. Free and Go users can use GPT-6 Luna in the ChatGPT desktop app.[1]

  7. In OpenAI's API they're gpt-6-sol and gpt-6-luna.[1]

Can you use GPT-6 Sol and GPT-6 Luna in llmwise?

What GPT-6 Sol and GPT-6 Luna cost you in llmwise, from the plans themselves.

GPT-6 Sol

GPT-6 Sol has been in llmwise since September 25, 2026. llmwise's catalog prices it at $2.00 per million tokens in and $10.00 out (OpenAI's list price). But a GPT-6 Sol message isn't billed by the token: the table below has its count on every plan.

GPT-6 Luna

GPT-6 Luna has been in llmwise since September 23, 2026. llmwise's catalog prices it at $0.10 per million tokens in and $0.50 out (OpenAI's list price). But a GPT-6 Luna message isn't billed by the token: the table below has its count on every plan.

GPT-6 Sol and GPT-6 Luna on every llmwise plan
PlanGPT-6 SolGPT-6 Luna
Free ($0)Not in the trialNot in the trial
Plus ($10)Up to 62 a month, about $0.16 each30 a day
Pro ($20)Up to 125 a month, about $0.16 each60 a day
Max ($50)Up to 400 a month, about $0.13 each120 a day
Ultra ($100)Up to 900 a month, about $0.11 each200 a day
Studio ($200)Up to 2,000 a month, about $0.10 each200 a day

A paid plan's month is one allowance the models share. So a monthly count is the most you get if the month goes to that model, and “each” is the plan's price divided by it. Every message's price is shown before you send it. Every plan.

The counts above come with each plan's fair-use limit, in AI cost a month: Plus's is $3.75, Pro's $7.50, Max's $20, Ultra's $42, Studio's $85. That leaves room for every message at typical sizes, less if messages run very long or research-heavy. Every limit, explained.

How did GPT-6 Sol and GPT-6 Luna do on our test prompts?

Beside Claude Sonnet 5.5 and Claude Sonnet 5, the models from other makers nearest in price per message.

GPT-6 Sol and GPT-6 Luna and the nearest-priced rivals: prompts passed
Prompt kindGPT-6 SolGPT-6 LunaClaude Sonnet 5.5Claude Sonnet 5
Writing4 of 55 of 54 of 54 of 5
Math5 of 54 of 55 of 55 of 5
Summarization4 of 54 of 54 of 53 of 5
Data analysis5 of 55 of 55 of 54 of 5
Support replies3 of 54 of 54 of 55 of 5
Translation4 of 55 of 55 of 55 of 5
In total45 of 5047 of 5047 of 5046 of 50

All passed every prompt on coding, SQL, answering from documents, and tool use. Through OpenRouter, in our test runs of September 27, 28, 29 and October 2, 7, 8, 9, 15, 2026; every model got the same prompts. Read the replies.

Sources

  1. [1] OpenAI: Introducing GPT-6 Sol and Luna, published .
  2. [2] OpenAI News, which lists the post under September 22, 2026, checked .
  3. [3] OpenAI API docs: GPT-6 Sol, checked .
Bar chart: GPT-6 Sol messages on each llmwise plan. Plus ($10): up to 62 a month; Pro ($20): up to 125 a month; Max ($50): up to 400 a month; Ultra ($100): up to 900 a month; Studio ($200): up to 2,000 a month.
llmwise's published counts, plan by plan.

GPT-6 Sol: what it means for you

Can I use GPT-6 Sol in llmwise?

Yes, since September 25, 2026. GPT-6 Sol's messages a month: up to 62 on Plus ($10), 125 on Pro ($20), 400 on Max ($50), 900 on Ultra ($100), 2,000 on Studio ($200). It isn't in the free trial.

Can I use GPT-6 Luna in llmwise?

Yes, since September 23, 2026. GPT-6 Luna's messages a day: 30 on Plus ($10), 60 on Pro ($20), 120 on Max ($50), 200 on Ultra ($100), 200 on Studio ($200). It isn't in the free trial.

GPT-6 Sol is in llmwise

Up to 125 GPT-6 Sol messages a month on Pro ($20). Its count shows before you send.

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