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API price comparison · checked Oct 23, 2026
Claude Haiku 5.5 vs GPT-6 Luna: API price
Short answerClaude Haiku 5.5 and GPT-6 Luna cost the same for a chatbot reply: $0.35 per 1,000. Standard prices: Claude Haiku 5.5 $0.1 / $0.5, GPT-6 Luna $0.1 / $0.5 per 1M input / output tokens, checked Oct 23, 2026.
Cost of the same work
| Workload (1,000 requests) | Claude Haiku 5.5 | GPT-6 Luna | Ratio |
|---|---|---|---|
| Chatbot replya 1,500-token prompt (1,000 of it a fixed system prompt) and a 400-token answer | $0.35 | $0.35 | 1.00x |
| Answer from your docs (RAG)6,000 tokens of retrieved context plus the question, a 500-token answer | $0.85 | $0.85 | 1.00x |
| Summarize a long documenta 20,000-token document in, an 800-token summary out | $2.40 | $2.40 | 1.00x |
| Coding agent step40,000 tokens of repo context and history (30,000 of it repeated from the last step), 2,000 out | $5.00 | $5.00 | 1.00x |
| Batch extraction2,000 tokens per record in, 300 tokens of JSON out, sent through the batch API where there is one | $0.17 | $0.17 | 1.00x |
| Long-document Q&Aa 150,000-token contract or codebase in one prompt, a 1,000-token answer | $77.50 | $15.50 | 5.00x |
Side by side
| Price | Claude Haiku 5.5 | GPT-6 Luna |
|---|---|---|
| Input / 1M | $0.1 | $0.1 |
| Output / 1M | $0.5 | $0.5 |
| Cache read / 1M | $0.01 | $0.01 |
| Batch input / output | $0.05 / $0.25 | $0.05 / $0.25 |
| Long-prompt tier | over 100,000 | over 272,000 |
| Provider | Anthropic | OpenAI |
| Status | listed | listed |
When each one is cheaper
- GPT-6 Luna is cheaper or equal on both input and output, so it costs less on every workload at standard prices.
- With caching on a coding-agent step (30,000 of 40,000 input tokens cached): Claude Haiku 5.5 $2.30 vs GPT-6 Luna $2.30 per 1,000 steps (1.00x).
- At 150,000 input tokens a long-prompt price kicks in for Claude Haiku 5.5, which moves the long-document row to 5.00x.
- This page compares price only. Which model answers better for your task is a separate question: test both on your own prompts.
Each model in full
Sources
- Anthropic API pricing: https://platform.claude.com/docs/en/about-claude/pricing, checked Oct 23, 2026.
- OpenAI API pricing: https://developers.openai.com/api/docs/pricing, checked Oct 23, 2026.