Claude Haiku 5.5 vs GPT-6 Luna: pricing and benchmarks
Both charge $0.10 per 1M input tokens. Both charge $0.50 per 1M output tokens. On our document Q&A workload both models cost $55.00 a month. Roughly tied. Claude Haiku 5.5 scores 159.0 and GPT-6 Luna scores 156.3 on the Epoch Capabilities Index, and their confidence intervals overlap.
Prices verified October 17, 2026.
Which should you choose?
Roughly tied. Claude Haiku 5.5 scores 159.0 and GPT-6 Luna scores 156.3 on the Epoch Capabilities Index, and their confidence intervals overlap.
GPT-6 Luna scores 78.9% on FrontierMath (Tiers 1–3) vs 75.1% for Claude Haiku 5.5.
Both cost $0.20 per 1M tokens at a 3:1 input-to-output mix.
Pricing and specs
| Claude Haiku 5.5 | GPT-6 Luna | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| API model ID | claude-haiku-5-5 | gpt-6-luna |
| Input / 1M tokens | $0.10 | $0.10 |
| Cached input / 1M tokens | $0.01 | $0.01 |
| Output / 1M tokens | $0.50 | $0.50 |
| Long-context rates | $0.50 in / $2.50 out above 100K prompt tokens | $0.20 in / $0.75 out on long-context requests |
| Context window | 1M tokens | 1.05M tokens |
| Max output | 128K tokens | 128K tokens |
| Batch discount | 50% off | 50% off |
Benchmarks
| Claude Haiku 5.5 | GPT-6 Luna | |
|---|---|---|
| Epoch Capabilities Index | 159.0 | 156.3 |
| GPQA Diamond· Science reasoning | 89.6% | 90.5% |
| FrontierMath (Tiers 1–3)· Advanced math | 75.1% | 78.9% |
| SimpleQA Verified· Factual accuracy | 23.8% | 41.4% |
| ARC-AGI-2· Abstract reasoning | — | 59.3% |
| DeepSWE· Coding | — | — |
| APEX-Agents· Agentic work | 56.1% | 44.3% |
Source: Epoch AI, best recorded result per model (CC BY 4.0). A dash means no published score. See all benchmarks
Monthly cost for real workloads
| Workload | Claude Haiku 5.5 | GPT-6 Luna | Difference |
|---|---|---|---|
Support chatbot 100,000 replies a month, ~1,500 input tokens (system prompt + history) and ~400 output tokens each. | $35.00 | $35.00 | Same |
Document Q&A (RAG) 50,000 questions a month with ~8,000 tokens of retrieved context and ~600 output tokens each. | $55.00 | $55.00 | Same |
Coding agent 10,000 agent steps a month, ~40,000 input tokens each (70% read from the prompt cache) and ~2,000 output tokens. | $24.80 | $24.80 | Same |
Estimates use standard list prices and ignore cache-write surcharges. Different tokenizers can count the same text differently, so test with your own prompts.
Claude Haiku 5.5 vs GPT-6 Luna cost calculator
- $55.00/mo$0.0011 / request
- Claude Haiku 5.5Anthropic$55.00/mo$0.0011 / request
Standard-tier list prices. Long-context rates apply automatically where the provider publishes a threshold. Excludes cache-write surcharges, taxes, batch and volume discounts.
Claude Haiku 5.5 pricing notes
Anthropic’s fastest, lowest-cost model, priced by prompt length, with a 1M-token context window.
- Prompts over 100K tokens, counting cache reads and writes, are billed at $0.50 input / $2.50 output per 1M tokens.
- Cache writes cost $0.125 (5-minute cache) or $0.20 (1-hour cache) per 1M tokens, 5x that above 100K tokens.
- US-only inference (inference_geo: "us") costs 1.1x.
GPT-6 Luna pricing notes
OpenAI’s most efficient GPT-6 model, for focused, high-volume tasks.
- Cache writes are billed at $0.125 per 1M tokens.
- Fast mode costs 2x the standard rate; Flex costs half.
- Regional (data residency) endpoints add a 10% uplift, and EU data residency is available only with standard processing.
Frequently asked questions
- Is Claude Haiku 5.5 cheaper than GPT-6 Luna?
- Both charge $0.10 per 1M input tokens. Both charge $0.50 per 1M output tokens. On our document Q&A workload both models cost $55.00 a month.
- Which is more capable, Claude Haiku 5.5 or GPT-6 Luna?
- Roughly tied. Claude Haiku 5.5 scores 159.0 and GPT-6 Luna scores 156.3 on the Epoch Capabilities Index, and their confidence intervals overlap.
- How much does Claude Haiku 5.5 cost per 1M tokens?
- Claude Haiku 5.5 costs $0.10 per 1M input tokens and $0.50 per 1M output tokens, and $0.01 per 1M cached input tokens on Anthropic’s standard tier.
- How much does GPT-6 Luna cost per 1M tokens?
- GPT-6 Luna costs $0.10 per 1M input tokens and $0.50 per 1M output tokens, and $0.01 per 1M cached input tokens on OpenAI’s standard tier.
- Which has the larger context window, Claude Haiku 5.5 or GPT-6 Luna?
- GPT-6 Luna has the larger context window: 1.05M tokens versus 1M for Claude Haiku 5.5.