darwin/.env.example at main · nathanaronson/darwin · GitHub

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# ── LLM provider ───────────────────────────────────────────────────
# "claude" (default) or "gemini". Switching providers does NOT rewrite
# the model IDs below — set them to values appropriate for the chosen
# provider (see examples after each block).
LLM_PROVIDER=claude

# Claude (required when LLM_PROVIDER=claude)
ANTHROPIC_API_KEY=sk-ant-...

# Gemini (required when LLM_PROVIDER=gemini)
# GOOGLE_API_KEY=...

# ── Models ─────────────────────────────────────────────────────────
# Claude defaults:
STRATEGIST_MODEL=claude-opus-4-6
PLAYER_MODEL=claude-sonnet-4-6
BUILDER_MODEL=claude-sonnet-4-6

# Gemini examples (uncomment + swap if LLM_PROVIDER=gemini):
# STRATEGIST_MODEL=gemini-2.5-flash
# PLAYER_MODEL=gemini-2.5-flash
# BUILDER_MODEL=gemini-2.5-flash

# ── Database ───────────────────────────────────────────────────────
DATABASE_URL=sqlite:///./darwin.db

# ── Tournament defaults ────────────────────────────────────────────
TIME_PER_MOVE_MS=20000
GAMES_PER_PAIRING=2
# Max games run concurrently in the local tournament backend. Default 16
# is enough to run a typical 3-engine cohort (12 games) fully in parallel.
# Lower this if your LLM provider rate-limits aggressively (Anthropic and
# Google's free tiers will both throttle near 16 concurrent calls).
MAX_PARALLEL_GAMES=16
MAX_MOVES_PER_GAME=120

# ── API ────────────────────────────────────────────────────────────
API_HOST=127.0.0.1
API_PORT=8000