Claude Haiku 5.5 vs GPT-6 Luna: API pricing and agent cost
| Model | Provider | Input $/1M | Output $/1M | Cached $/1M | Per task | Per month |
|---|---|---|---|---|---|---|
| Claude Haiku 5.5 | Anthropic | $0.1 | $0.5 | $0.01 | $0.0035 | $10.50 |
| GPT-6 Luna | OpenAI | $0.1 | $0.5 | $0.01 | $0.0035 | $10.50 |
For an agent making 5 tool calls per task (3,000 input and 800 output tokens per call) and running 100 tasks a day, Claude Haiku 5.5 is the cheaper option at $10.50 a month, versus $10.50 for GPT-6 Luna (1.0× the cost).
This compares list prices only, not quality. Prompts up to 100K tokens; $0.50/$2.50 above 100K ($0.05 cached). Prompts with more than 272K input tokens are priced at 2x input and cache rates and 1.5x output for the full request (OpenAI model page). Derived long-context rate: $0.20 in / $0.02 cached / $0.75 out.
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