# Claude Opus 5.5, GPT-6 Sol and GPT-6 Luna models added

> Claude Opus 5.5 becomes the recommended Opus model, and GPT-6 Luna replaces GPT-5.6 Terra as the platform default model and the default utility model.

Source: <https://everruns.com/docs/changelog/2026-09-22-claude-opus-5-5-gpt-6-models/>

Date: 2026-09-22
Products: Platform, Cloud
Category: Feature
Available: In 0.30.0
Pull request: everruns/everruns#3769
Pull request: everruns/everruns#3771
Pull request: everruns/everruns#3774

Three new models are available: Claude Opus 5.5 (`claude-opus-5-5`, plus the 1M-context `claude-opus-5-5[1m]`), GPT-6 Sol (`gpt-6-sol`) and GPT-6 Luna (`gpt-6-luna`). All are seeded as enabled favorites, and Opus 5.5 is marked as the recommended Anthropic model. Opus 5 stays enabled for existing agents.

GPT-6 Luna replaces GPT-5.6 Terra as the platform default model. It is also the default utility model behind Agent Analyze, Health checks and `llm_judge` guardrails; set `UTILITY_LLM_MODEL` to choose another.

See [Anthropic](https://everruns.com/docs/providers/anthropic/), [OpenAI](https://everruns.com/docs/providers/openai/) and [environment variables](https://everruns.com/docs/sre/environment-variables/). PRs [#3769](https://github.com/everruns/everruns/pull/3769), [#3771](https://github.com/everruns/everruns/pull/3771), [#3774](https://github.com/everruns/everruns/pull/3774).