Problem
The proxy server fails to optimize requests for newer Claude models, logging warnings like:
WARNING - Optimization failed: Unknown Anthropic model: claude-opus-4-5-20251101. Configure context_limits explicitly.
Missing Models
claude-opus-4-5-20251101 (Claude Opus 4.5)claude-haiku-4-5-20251001 (Claude Haiku 4)
Impact
When an unknown model is used, optimization is skipped entirely for that request, defeating the purpose of the proxy.
Suggested Fix
Add the new models to both dictionaries in headroom/providers/anthropic.py:
ANTHROPIC_CONTEXT_LIMITS: dict[str, int] = {
# ... existing models ...
"claude-opus-4-5-20251101": 200000,
"claude-sonnet-4-20250514": 200000,
}
ANTHROPIC_PRICING: dict[str, dict[str, float]] = {
# ... existing models ...
"claude-opus-4-5-20251101": {"input": 15.00, "output": 75.00, "cached_input": 1.50},
"claude-sonnet-4-20250514": {"input": 3.00, "output": 15.00, "cached_input": 0.30},
}
Maybe add a mechanism to specify custom model limits without code changes (config file, environment variable, or API endpoint to fetch current models)?
Problem
The proxy server fails to optimize requests for newer Claude models, logging warnings like:
WARNING - Optimization failed: Unknown Anthropic model: claude-opus-4-5-20251101. Configure context_limits explicitly.
Missing Models
claude-opus-4-5-20251101(Claude Opus 4.5)claude-haiku-4-5-20251001(Claude Haiku 4)Impact
When an unknown model is used, optimization is skipped entirely for that request, defeating the purpose of the proxy.
Suggested Fix
Add the new models to both dictionaries in
headroom/providers/anthropic.py: