Add documentation for Claude Opus 4.5, Gemini 3 Pro, and GPT-5.1 models

[Copilot]

Add documentation for newly supported LLM models and create public/llms.txt for LLM discovery.

Changes

docs/cody/capabilities/supported-models.mdx

• Added GPT-5.1 (OpenAI) with vision support
• Added Claude Opus 4.5 and Claude Opus 4.5 w/ Thinking (Anthropic) with vision support
• Added Gemini 3 Pro (Google) with vision support
• Removed duplicate Gemini 2.0 Flash entry (pre-existing issue)

public/llms.txt

• Created comprehensive LLM listing for Chat/Prompts, Autocomplete, and Smart Apply categories
• Includes all supported models with vision capability annotations

Original prompt

add documentation for the following models in docs/cody/capabilities/supported-models.mdx and public/llms.txt:

• Opus 4-5 https://platform.claude.com/docs/en/about-claude/models/overview
• Gemini 3 Pro https://docs.cloud.google.com/vertex-ai/generative-ai/docs/models/gemini/3-pro
• GPT 5.1 https://platform.openai.com/docs/models/gpt-5.1

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Project	Deployment	Preview	Comments	Updated (UTC)
sourcegraph-docs	Ready	Preview	Comment	Nov 26, 2025 10:48pm