Anthropic Claude
Claude Haiku 5.5
$0.20 / 1M tokens
cheapest at Anthropic · $0.10 in · $0.50 out
Wins 2 of 4
Head to head · prices updated Oct 31, 2026
Claude Haiku 5.5 vs GPT-6 Luna
Claude Haiku 5.5 and GPT-6 Luna cost about the same at their cheapest providers.
OpenAI
GPT-6 Luna
$0.20 / 1M tokens
cheapest at OpenAI · $0.10 in · $0.50 out
Wins 1 of 4
- Lower priceTie
- Higher accuracy (GPQA)GPT-6 Luna
- Longer contextClaude Haiku 5.5
- More providersClaude Haiku 5.5
Verdict
Same price, choose on quality
Claude Haiku 5.5 and GPT-6 Luna cost about the same at their cheapest providers.
GPT-6 Luna scores higher on GPQA Diamond: 90.5% (max reasoning) vs 89.6% (max reasoning).
Claude Haiku 5.5 accepts longer prompts (1000K vs 922K tokens).
Your monthly bill
What would each cost you?
Both cost the same for this workload.
Side by side
| Claude Haiku 5.5 | GPT-6 Luna | |
|---|---|---|
| Cheapest blended price / 1M | $0.20 | $0.20 |
| Input / output per 1M | $0.10 / $0.50 | $0.10 / $0.50 |
| Accuracy (GPQA Diamond) | 89.6% (max reasoning) | 90.5% (max reasoning) |
| Max context | 1M | 922K |
| Providers we track | 4 | 3 |
Standard list prices at each model's cheapest provider we track; blended = 3 input : 1 output tokens. GPQA Diamond from Epoch AI (CC BY 4.0), best measured reasoning setting, named next to each score. Methodology.
Where to buy each one
Questions people ask
Is Claude Haiku 5.5 cheaper than GPT-6 Luna?
Claude Haiku 5.5 and GPT-6 Luna cost about the same at their cheapest providers.
Which is more accurate, Claude Haiku 5.5 or GPT-6 Luna?
On GPQA Diamond (graduate-level science questions, measured by Epoch AI) Claude Haiku 5.5 scores 89.6% (max reasoning) and GPT-6 Luna 90.5% (max reasoning). One benchmark is not the whole picture; test both on your own prompts.
How much does Claude Haiku 5.5 cost per 1M tokens?
From $0.10 input and $0.50 output per 1M tokens at Anthropic, the cheapest of 4 providers we track.
How much does GPT-6 Luna cost per 1M tokens?
From $0.10 input and $0.50 output per 1M tokens at OpenAI, the cheapest of 3 providers we track.
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