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21 – 27 September 2026

GPT-6 fills out its range, Claude Opus 5.5 cuts prices

A busy week: OpenAI releases two more affordable GPT-6 models, Anthropic launches Opus 5.5 at flagship level for much less, and xAI ships Grok 4.7.

  1. ModelOpenAIOfficial source

    OpenAI launches GPT-6 Sol and GPT-6 Luna

    After GPT-6 Astra in early September, OpenAI adds Sol, aimed at programming at a moderate price, and Luna, a very cheap model for high volumes.

    What it changes: For users: recent models available at lower cost in the tools that integrate them.

    GPT version history OpenAI — Introducing GPT-6 Sol and Luna

  2. ModelAnthropicOfficial source

    Anthropic releases Claude Opus 5.5

    According to Anthropic, the new model matches Claude Fable 5.1 on most tasks, at a running cost about 40% lower than Opus 5. It targets coding and long tasks.

    Claude version history Anthropic — Introducing Claude Opus 5.5

  3. ModelxAIOfficial source

    xAI ships Grok 4.7

    A 500,000-token context and a low price; the model is available in Cursor, Grok Build and the xAI API.

    Grok version history xAI — Introducing Grok 4.7

  4. ProductGitHub, MicrosoftOfficial source

    The new models arrive in GitHub Copilot

    GPT-6 Sol, GPT-6 Luna and Claude Opus 5.5 become available in GitHub’s coding assistant right after their release.

    GitHub Changelog — Claude Opus 5.5 is now available in GitHub Copilot

This week’s analysis

Providers no longer just release one “big” model: they offer each generation in cheaper versions. For the general public, this means more capable assistants in free or entry-level plans.