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Models

Tachikoma ships with a built-in model catalog (CaseIterable enums) plus support for arbitrary model ids via .custom(...) and compatible/custom endpoints.

Default

  • LanguageModel.default: claude-opus-4-8
  • LanguageModel.defaultStreaming: gpt-5.5

OpenAI (LanguageModel.OpenAI)

  • gpt-5.6-sol, gpt-5.6-terra, gpt-5.6-luna (preview; bare gpt-5.6 selects Sol)
  • gpt-5.5
  • gpt-5.4, gpt-5.4-mini, gpt-5.4-nano
  • gpt-5, gpt-5-pro, gpt-5-mini, gpt-5-nano

Notes:

  • Older gpt-5.1, gpt-5.2, gpt-5-thinking*, and gpt-5-chat-latest ids are not first-class catalog entries.

Anthropic (LanguageModel.Anthropic)

  • claude-sonnet-5 (1M context, 128K max output)
  • claude-fable-5 (1M context, 128K max output, non-streaming, explicit opt-in)
  • claude-opus-4-8 (1M context, 128K max output, non-streaming until refusal rollback is streaming-safe)
  • claude-opus-4-7
  • claude-opus-4-5
  • claude-opus-4-1-20250805
  • claude-sonnet-4-6
  • claude-sonnet-4-5-20250929
  • claude-haiku-4-5

Google (LanguageModel.Google)

  • gemini-3.1-pro-preview
  • gemini-3.1-flash-lite
  • gemini-3-flash (API id currently maps to gemini-3-flash-preview)
  • gemini-2.5-pro, gemini-2.5-flash, gemini-2.5-flash-lite

MiniMax (LanguageModel.MiniMax)

  • MiniMax-M3 (1M context, multimodal image input)
  • MiniMax-M2.7
  • MiniMax-M2.7-highspeed

Kimi / Moonshot AI (LanguageModel.Kimi)

  • kimi-k2.6
  • kimi-k2.7-code
  • kimi-k2.7-code-highspeed

Kimi uses Moonshot's OpenAI-compatible endpoint at https://api.moonshot.ai/v1. Configure MOONSHOT_API_KEY (or KIMI_API_KEY); override the endpoint with MOONSHOT_BASE_URL. K2.7 tool-call turns preserve Moonshot's provider-native reasoning_content when replaying assistant history.

xAI Grok (LanguageModel.Grok)

  • grok-4.3
  • grok-4.20-0309-reasoning, grok-4.20-0309-non-reasoning

Mistral (LanguageModel.Mistral)

  • mistral-large-latest, mistral-medium-latest, mistral-medium-3-5
  • mistral-small-latest, open-mistral-nemo-2407, codestral-latest

Groq (LanguageModel.Groq)

  • openai/gpt-oss-120b, openai/gpt-oss-20b
  • llama-3.3-70b-versatile, llama-3.1-8b-instant
  • meta-llama/llama-4-maverick-17b-128e-instruct
  • meta-llama/llama-4-scout-17b-16e-instruct

Local (LanguageModel.Ollama, LanguageModel.LMStudio)

Local providers ship curated enums plus .custom("<model-id>") for anything your server exposes.

Aggregators / custom endpoints

  • .openRouter(modelId:), .together(modelId:), .replicate(modelId:)
  • .openaiCompatible(modelId:baseURL:), .anthropicCompatible(modelId:baseURL:), .custom(provider:)