Claude Haiku 5.5 vs GPT-6 Luna
Facts only. This page does not pick a winner. For a picked winner, see the use case comparison on Tools.
| Claude Haiku 5.5 | GPT-6 Luna | |
|---|---|---|
| API model IDs | claude-haiku-5-5 | gpt-6-luna |
| Context window | 1,000,000 | 1,050,000 |
| Lifecycle | active | active |
| License | proprietary | proprietary |
| Trains on API data | No | No |
| Zero data retention | on-request | on-request |
| Input per 1M tokens | $0.1 (verified 2026-11-05) | $0.1 (verified 2026-11-05) |
Frequently asked questions
- Which has the larger context window, Claude Haiku 5.5 or GPT-6 Luna?
- Claude Haiku 5.5 holds 1,000,000 tokens and GPT-6 Luna holds 1,050,000. GPT-6 Luna holds more. The context window counts the prompt, any attached files, and the reply together.
- Which is cheaper, Claude Haiku 5.5 or GPT-6 Luna?
- Per million input tokens, Claude Haiku 5.5 was $0.1 (verified 2026-11-05) and GPT-6 Luna was $0.1 (verified 2026-11-05). Input pricing is the same on both. Output tokens cost $0.5 and $0.5 respectively, and output volume usually decides the bill.
- Does Claude Haiku 5.5 or GPT-6 Luna train on API data?
- Claude Haiku 5.5 does not train on API data by default, and GPT-6 Luna does not train on API data by default. Zero data retention is on-request for Claude Haiku 5.5 and on-request for GPT-6 Luna. Verified 2026-09-08 and 2026-09-08 against the providers' own documentation.
- Is Claude Haiku 5.5 or GPT-6 Luna being retired?
- Claude Haiku 5.5 is active. GPT-6 Luna is active. Lifecycle checked 2026-11-05 and 2026-11-05. Pin a dated snapshot ID rather than an alias if a retirement would break you.