Claude Haiku 5.5 vs GPT-6 Luna
Claude Haiku 5.5 scores higher on the Models at Work leaderboard (74 vs 66 out of 100). They cost about the same per million tokens ($0.20 vs $0.20 blended). On Artificial Analysis' independent Intelligence Index, Claude Haiku 5.5 leads 43 to 38.
| Claude Haiku 5.5 · Anthropic | GPT-6 Luna · OpenAI | |
|---|---|---|
| Leaderboard rank | #7 | #10 |
| Score (0–100) | 74 | 66 |
| Tier | Fast and cheap | Fast and cheap |
| Price per 1M tokens | $0.10 in · $0.50 out | $0.10 in · $0.50 out |
| Context window | 1M | 1M |
| Open weights | No | No |
| Artificial Analysis Intelligence Index | 43 | 38 |
| Best for | Classification and extraction, Routing tiers, Latency-sensitive paths | ChatGPT Free and Go tier, Simple extraction, Cost floors |
Choose Claude Haiku 5.5 if…
- you need classification and extraction
- you need routing tiers
- you need latency-sensitive paths
Ten cents a million and, per the people using it, smarter than the other ten-cent model; mind the 100K cliff.
Caveats: Price jumps five-fold above 100K input tokens, which commenters call an absurdly low cutoff for agent runs.
Choose GPT-6 Luna if…
- you need chatgpt free and go tier
- you need simple extraction
- you need cost floors
OpenAI's ten-cent model: the one every ChatGPT Free user now has, and the one Haiku users keep comparing themselves to.
What practitioners say
Claude Haiku 5.5: The thread had over a thousand points in a day; the recurring reports are near-perfect structured classification in production and 'noticeably smarter than GPT-6 Luna', against complaints about the 100K pricing tier.
Questions people ask
Which is better, Claude Haiku 5.5 or GPT-6 Luna?
Claude Haiku 5.5 scores higher on the Models at Work leaderboard (74 vs 66 out of 100). They cost about the same per million tokens ($0.20 vs $0.20 blended). On Artificial Analysis' independent Intelligence Index, Claude Haiku 5.5 leads 43 to 38.
When should I choose Claude Haiku 5.5 over GPT-6 Luna?
Choose Claude Haiku 5.5 for classification and extraction, routing tiers, latency-sensitive paths. Ten cents a million and, per the people using it, smarter than the other ten-cent model; mind the 100K cliff.
When should I choose GPT-6 Luna over Claude Haiku 5.5?
Choose GPT-6 Luna for chatgpt free and go tier, simple extraction, cost floors. OpenAI's ten-cent model: the one every ChatGPT Free user now has, and the one Haiku users keep comparing themselves to.
Which is cheaper, Claude Haiku 5.5 or GPT-6 Luna?
Claude Haiku 5.5 costs $0.10 per million input tokens and $0.50 per million output tokens on Anthropic's list price (Claude pricing, read Oct 10, 2026). GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output tokens on OpenAI's list price (OpenAI API pricing, read Oct 10, 2026).
Scores come from the Models at Work leaderboard: Score is 0 to 100: 50% independent evals normalised within this table, 20% price-performance, 15% practitioner sentiment from Signals and community threads, 15% operational fit (context, speed, availability, open weights). Models within three points are a tie in practice. Vendor-published figures are labelled as such and never counted as independent. Prices are vendor list prices where published; blended figures assume three input tokens per output token.