GPT-6 Luna vs Claude Haiku 5.5 — LLM API Cost Comparison
Compare GPT-6 Luna (OpenAI) vs Claude Haiku 5.5 (Anthropic) on cost per million tokens, context window, and monthly spend.
Pricing data updated 2026-11-02 · Pricing may change — use the calculator for current estimates
- Input
- $0.1/1M tokens
- Output
- $0.5/1M tokens
- Context
- 1M tokens
- Released
- 2026-09
Auto-added 2026-11; set isCurrent: true after review
- Input
- $0.1/1M tokens
- Output
- $0.5/1M tokens
- Context
- 1M tokens
- Released
- 2026-10
Auto-added 2026-11; set isCurrent: true after review
Monthly Cost by Usage Tier (70% input / 30% output ratio)
| Usage | GPT-6 Luna | Claude Haiku 5.5 | Cheaper by |
|---|---|---|---|
| Light (1M tokens) | $0.220 | $0.220 | Equal |
| Moderate (10M tokens) | $2.20 | $2.20 | Equal |
| Heavy (100M tokens) | $22.00 | $22.00 | Equal |
| Very Heavy (1B tokens) | $220 | $220 | Equal |
Frequently Asked Questions
Which is cheaper — GPT-6 Luna or Claude Haiku 5.5?
Both models have the same input rate of $0.1/1M tokens. Both models have the same output rate of $0.5/1M tokens. Total cost depends on the input and output mix.
What is the context window difference between GPT-6 Luna and Claude Haiku 5.5?
GPT-6 Luna supports 1,050,000 tokens per request; Claude Haiku 5.5 supports 1,000,000 tokens. GPT-6 Luna has the longer listed context window.
When should I choose GPT-6 Luna over Claude Haiku 5.5?
Choose GPT-6 Luna (OpenAI) if you prefer OpenAI's ecosystem, tooling, or reliability track record. Auto-added 2026-11; set isCurrent: true after review. Choose Claude Haiku 5.5 (Anthropic) if Auto-added 2026-11; set isCurrent: true after review. the price/performance fits your workload better. Use this calculator to find the break-even point for your exact token volume.
How much does 1 billion tokens cost on GPT-6 Luna vs Claude Haiku 5.5?
At 700M input + 300M output tokens (1B total): GPT-6 Luna costs $220; Claude Haiku 5.5 costs $220. The difference is $0/billion tokens at this 70/30 input/output ratio.