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Put models side by side on price, context, capabilities, and benchmarks.
This is OpenRouter's auto-updating alias to OpenAI's current 'Luna' model, always resolving to the newest release in that family (1.05M-token context) rather than a pinned snapshot. Luna is the cheapest and fastest tier in OpenAI's Sol/Terra/Luna/Astra alias family, priced roughly ten times below Sol and suited to high-volume, latency-sensitive chat and lightweight agent work.
Claude Haiku 4.5 is Anthropic's fast, affordable small model in the Claude 4 generation, balancing strong instruction-following and coding ability with low latency. It is designed for high-throughput agentic and chat applications where speed and cost efficiency are priorities.
Benchmarks
Head-to-head scores across reasoning, coding, and agentic indices, plus per-domain rankings.
Intelligence
Claude Opus 5.5 (Max, Default Fallback)Claude Sonnet 5.5 (Max, Default Fallback)
