Meerkat is provider-agnostic. Your tools, sessions, hooks, and configuration work identically across Anthropic, OpenAI, and Gemini. Switch providers by changing the model name — no code changes. Set an API key for at least one.
Provider setup export ANTHROPIC_API_KEY = "sk-ant-..."
Model Context Max output Best for claude-opus-4-6200K / 1M (beta) 128K Complex reasoning, highest quality claude-sonnet-4-5200K / 1M (beta) 64K Balanced performance and cost claude-opus-4-5200K 64K Legacy Opus (still supported) claude-haiku-4-5200K 64K Fast, simple tasks
[ agent ] model = "claude-opus-4-6" max_tokens_per_turn = 16384
export OPENAI_API_KEY = "sk-..."
Model Context Best for gpt-5.21M General purpose, advanced reasoning gpt-5.2-pro1M Highest quality reasoning gpt-5.1-codex-max1M Code generation, agentic coding
[ agent ] model = "gpt-5.2" max_tokens_per_turn = 8192
export GOOGLE_API_KEY = "AIza..."
Model Context Best for gemini-3-pro-preview1M Advanced reasoning, complex tasks gemini-3-flash-preview1M Fast, balanced performance
[ agent ] model = "gemini-3-pro-preview" max_tokens_per_turn = 8192
Environment variables Variable Fallback Provider RKAT_ANTHROPIC_API_KEYANTHROPIC_API_KEYAnthropic Claude RKAT_OPENAI_API_KEYOPENAI_API_KEYOpenAI GPT RKAT_GEMINI_API_KEYGEMINI_API_KEY, GOOGLE_API_KEYGoogle Gemini
The RKAT_* variants take precedence over provider-native names, so you can run Meerkat with dedicated keys separate from other tools.
SDK feature flags When using Meerkat as a Rust library, enable only the providers you need:
Feature Description Default anthropicAnthropic Claude support Yes openaiOpenAI GPT support No geminiGoogle Gemini support No all-providersAll LLM providers No
Anthropic only (smallest binary)
All providers
meerkat = { version = "0.1" , features = [ "anthropic" , "jsonl-store" ] }
Provider parameters Provider-specific options can be passed via the --param CLI flag or provider_params in the SDK:
Parameter Description thinking_budgetToken budget for extended thinking (integer) top_kTop-k sampling parameter (integer)
rkat run --model claude-sonnet-4-5 --param thinking_budget= 10000 "Solve this problem"
Parameter Values Description reasoning_effortlow, medium, highReasoning effort for o-series models seedInteger Seed for deterministic outputs
rkat run --model gpt-5.2 --param reasoning_effort=high "Prove this theorem"
Parameter Description thinking_budgetToken budget for extended thinking (integer) top_kTop-k sampling parameter (integer)
rkat run --model gemini-3-flash-preview --param thinking_budget= 5000 "Analyze this data"
Auto-detection The provider is automatically inferred from the model name:
claude-* models use Anthropicgpt-*, o1-*, o3-*, chatgpt-* models use OpenAIgemini-* models use Gemini
You can override this with --provider on the CLI or provider in API requests. 