GPT-6 Luna vs Claude Haiku 5.5
GPT-6 Luna costs $0.10 / $0.50 and Claude Haiku 5.5 costs $0.10 / $0.50 per million input / output tokens. At a typical 3:1 mix, GPT-6 Luna is about the same price.
Input
$0.10
per 1M
Output
$0.50
per 1M
Cached
$0.010
1.05M context
Input
$0.10
per 1M
Output
$0.50
per 1M
Cached
$0.010
1M context
Side by side
Green marks the cheaper price, larger context window, bigger discount or higher score.
| Detail | GPT-6 Luna | Claude Haiku 5.5 |
|---|---|---|
| Input per 1M | $0.10 | $0.10 |
| Output per 1M | $0.50 | $0.50 |
| Blended per 1M (3:1) | $0.20 | $0.20 |
| Cached input per 1M | $0.010 | $0.010 |
| Batch or off-peak discount | 50% (batch) | 50% (batch) |
| Long prompts | Over 272K: 2× in, 1.5× out | Over 100K: $0.50 / $2.50 |
| Context window | 1.05M | 1M |
| Released | 22 Sep 2026 | 7 Oct 2026 |
| Open weights | No | No |
| Verified | 13 Oct 2026 | 13 Oct 2026 |
Sources: OpenAI pricing and Anthropic pricing.
Monthly cost on three workloads
List prices, no batch discount. The cached share applies where a model has a cache rate.
| Workload | GPT-6 Luna | Claude Haiku 5.5 | Difference |
|---|---|---|---|
| Customer chat assistant50,000 conversations a month, about 2,000 tokens in and 400 out each; 50% cached | $15.50 | $15.50 | $0.00 |
| Document Q&A (RAG)20,000 questions a month over retrieved documents, 12,000 in and 600 out; 30% cached | $23.52 | $23.52 | $0.00 |
| Coding agent400 tasks a month, 40 steps each with a growing context; 85% cached | $21.63 | $21.63 | $0.00 |
How they differ
- GPT-6 Luna accepts longer prompts (1.05M vs 1M tokens).
Recent changes
All changes- ▼ 90%Claude Haiku 5.5 replaced Haiku 4.5 at $0.10 / $0.50 per 1M tokens for prompts up to 100K, 90% cheaper per token.
$1 / $5→ $0.10 / $0.50 - GPT-6.1 Sol replaced GPT-6 Sol at the same $2 / $10 per 1M tokens, with cached input cut from $0.20 to $0.10.
- OpenAI launched GPT-6 Sol at $2 / $10 and GPT-6 Luna at $0.10 / $0.50.
- OpenAI launched GPT-6 Astra at $10 / $50, its most expensive standard model.
