OpenAI GPT-5.6 (July 2026): Sol, Terra, and Luna arrive for developers

OpenAI launched the GPT-5.6 model family — Sol, Terra, and Luna — announcing that all three would become publicly available on July 9, 2026 after an initial limited preview in late June. (https://openai.com/news/)

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Three models: Luna, Terra, and Sol

GPT-5.6 comes in three tiers, from fastest to most capable:

• Luna — the fastest and most affordable member of the family, aimed at high-volume, latency-sensitive work.
• Terra — a balanced, everyday model positioned as competitive with GPT-5.5 while costing significantly less.
• Sol — the most capable model, tuned for frontier reasoning and long-horizon agentic work, with particular emphasis on domains like biology, chemistry, and cybersecurity.

OpenAI has described the family as built with strong safeguards intended to hold up under real-world adversarial pressure. (https://openai.com/news/)

How GPT-5.6 reaches developers

Beyond ChatGPT, GPT-5.6 is aimed squarely at developers. OpenAI's own Codex release notes confirm that GPT-5.6 Sol, Terra, and Luna are available on Amazon Bedrock, with first-class support for max reasoning effort, and that Bedrock model names now clearly identify the GPT-5.6 family and variant. (https://github.com/openai/codex/releases/tag/rust-v0.143.0)

That makes GPT-5.6 straightforward to adopt from the terminal via OpenAI Codex, and through the OpenAI API for application developers.

Reported pricing

According to launch reporting, the headline short-context rates (per 1M input / output tokens) are:

• Sol: $5 / $30
• Terra: $2.50 / $15
• Luna: $1 / $6

Terra is positioned as offering roughly GPT-5.5-class performance at a substantially lower cost, while Luna targets the cheapest, fastest tier. Confirm current pricing and context-length tiers in OpenAI's official pricing before budgeting. (https://openai.com/news/)

Why it matters

A three-model split lets teams match cost to the task: reach for Sol on hard, agentic, or high-stakes reasoning; default to Terra for everyday work; and use Luna where speed and price dominate. With Bedrock and API availability confirmed via OpenAI's Codex release notes, GPT-5.6 is usable in developer workflows from day one.

Note: OpenAI's public newsroom and help center pages were not directly reachable from our automation environment at publish time. Model names, variants (Sol/Terra/Luna), Amazon Bedrock availability, and max reasoning-effort support are confirmed by OpenAI's official Codex release notes on GitHub; the public launch date and reported pricing come from OpenAI's July 9, 2026 announcement and launch coverage. We will update this post if official figures differ.

Sources

• OpenAI — Newsroom: https://openai.com/news/
• OpenAI Codex release notes (GPT-5.6 Sol/Terra/Luna on Amazon Bedrock): https://github.com/openai/codex/releases/tag/rust-v0.143.0
• OpenAI Codex release notes (Bedrock names identify GPT-5.6 family/variant): https://github.com/openai/codex/releases/tag/rust-v0.144.0