Back to News

OpenAI launches GPT-6 Sol and Luna, claiming fewer mistakes and lower cost

1770 points · 848 comments#openai#gpt-6#model-launch#pricing

OpenAI launched two new models, GPT-6 Sol and Luna, on September 22, 2026, less than three months after GPT-5.6. The company claims Sol makes about half as many mistakes as GPT-5.6 Sol, while Luna matches GPT-5.6 Sol's performance at about 1% of the cost. Pricing for both models is about 50% cheaper than GPT-5.6, with Sol at $2/$10 per million input/output tokens and Luna at $0.10/$0.50.

Coverage timeline

  1. TechCrunch AILucas Ropek
    OpenAI launches GPT-6 Sol and Luna, boasting lower cost and fewer mistakes

    OpenAI is launching two new models, which it says are cut from the same cloth as Astra.

  2. Hacker NewsOfficialTurkey
    GPT-6 Sol and LunaHN
  3. Techmeme
    OpenAI launches GPT-6 Sol and Luna, saying Sol makes about half as many mistakes as GPT-5.6 Sol and Luna matches GPT-5.6 Sol's performance at ~1% of the cost (David Gewirtz/ZDNET)

    David Gewirtz / ZDNET : OpenAI launches GPT-6 Sol and Luna, saying Sol makes about half as many mistakes as GPT-5.6 Sol and Luna matches GPT-5.6 Sol's performance at ~1% of the cost — GPT-6 Sol and Luna arrive less than three months after GPT-5.6, with OpenAI claiming major accuracy gains, dramatic cost reductions …

  4. Techmeme
    GPT-6 Sol costs $2/1M input and $10/1M output tokens, and GPT-6 Luna costs $0.10/1M input and $0.50/1M output tokens, both about 50% cheaper than GPT-5.6 (Nat Rubio-Licht/The Deep View)

    Nat Rubio-Licht / The Deep View : GPT-6 Sol costs $2/1M input and $10/1M output tokens, and GPT-6 Luna costs $0.10/1M input and $0.50/1M output tokens, both about 50% cheaper than GPT-5.6 — OpenAI is releasing a more budget-friendly version of its most powerful model. — On Tuesday, the company unveiled GPT-6 Sol and GPT-6 Luna …

Related stories

  • OpenAI faces safety concerns over loop transformers in next model; Microsoft confirms GPT-6.1 Sol uses technique

    The Information reports that OpenAI is dealing with safety concerns over loop transformers, a controversial AI design technique, before shipping its next major model. Microsoft accidentally confirmed that GPT-6.1 Sol uses this technique, adding to the fallout.

    1 reports · 1 sources

  • OpenAI launches GPT-6.1 Sol Ultrafast, 8x faster than standard

    OpenAI released GPT-6.1 Sol Ultrafast, a faster version of its frontier model, claiming near-Astra intelligence at up to 8x the speed of the standard Sol. API pricing is $12 per million input tokens and $60 per million output tokens, six times the standard rate. The model is available to all users following the previous day's rollout of GPT-6 to free and paid tiers.

    2 reports · 2 sources

  • OpenAI rolls out GPT-6 with Sol and Luna variants across ChatGPT tiers

    OpenAI announced that GPT-6 in ChatGPT's Chat tab is now powered by GPT-6 Sol for Plus, Pro, Business, and Enterprise tiers, and GPT-6 Luna for Free and Go tiers. The rollout begins globally today for paid tiers, expanding to Free and Go users starting tomorrow, with both variants tuned for specific use cases.

    1 reports · 1 sources

  • OpenAI launches GPT-6.1 Sol, nearly matching Astra at one-fifth price

    OpenAI announced GPT-6.1 Sol at DevDay, an upgrade to GPT-6 Sol that nearly matches GPT-6 Astra on agentic coding, computer use, and professional work, at one-fifth of Astra's standard API prices. The model is priced at $2 per million input tokens and $10 per million output tokens, matching GPT-6 Sol and Claude Sonnet 5.5, and is available in ChatGPT Work, Codex, and the API. OpenAI also introduced a $500-per-month Pro 500 plan with Astra Ultrafast access and the always-on agent 'dots'.

    4 reports · 3 sources

News updates every hour. Subscribe in your RSS reader to get new stories automatically.

Subscribe