Head-to-head · Anthropic vs OpenAI
Claude Haiku 4.5 vs GPT-6 Luna
Quick answer: Claude Haiku 4.5 stands out for cheapest way to use Claude at scale. GPT-6 Luna stands out for extremely cheap for bulk processing. Reviewed September 2026.
Overview
Claude Haiku 4.5: Claude Haiku 4.5 is Anthropic's fast, low-cost model at $1 and $5 per million tokens. It suits high-volume tasks such as classification, extraction and short drafting, where response speed and cost matter more than deep reasoning.
GPT-6 Luna: GPT-6 Luna, launched on 22 September 2026, is the small, low-cost member of the GPT-6 family at $0.10 and $0.50 per million tokens. It targets high-volume tasks where cost and speed matter most.
At a glance
| Dimension | Claude Haiku 4.5 | GPT-6 Luna |
|---|---|---|
| Vendor | Anthropic | OpenAI |
| Starting price | API: $1 in / $5 out per M tokens | API: $0.10 in / $0.50 out per M tokens |
| Pricing model | Paid | Paid |
| Free tier | No | No |
| Category | Generative AI | Generative AI |
Strengths and limits
Claude Haiku 4.5
- Cheapest way to use Claude at scale
- Good quality for classification and extraction
- Low latency
Watch out for
- Weaker on long, multi-step reasoning
- Haiku 5.5 is announced as coming soon
- Less reliable on complex tool chains
GPT-6 Luna
- Extremely cheap for bulk processing
- Fast responses
- Good fit for classification and extraction
Watch out for
- Not suited to the hardest reasoning tasks
- Newest release with limited track record
- Quality varies by task, so test on your own data
Key features
Claude Haiku 4.5
- Fast responses for interactive and high-volume use
- Lowest price in the current Claude lineup
- Tool use support
- Batch pricing at half the standard rate
GPT-6 Luna
- Very low per-token pricing
- Built for high-volume and latency-sensitive work
- Shares GPT-6 family technology
- Available through the OpenAI API
Pricing compared
Claude Haiku 4.5 is priced by usage rather than by seat: API: $1 in / $5 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing.
GPT-6 Luna is priced by usage rather than by seat: API: $0.10 in / $0.50 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing.
Frequently asked questions
Which is better, Claude Haiku 4.5 or GPT-6 Luna?
It depends on the work. Claude Haiku 4.5 stands out for cheapest way to use Claude at scale. GPT-6 Luna stands out for extremely cheap for bulk processing.
How do Claude Haiku 4.5 and GPT-6 Luna compare on price?
Claude Haiku 4.5 is priced by usage rather than by seat: API: $1 in / $5 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing. GPT-6 Luna is priced by usage rather than by seat: API: $0.10 in / $0.50 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing.
Is there a free option between Claude Haiku 4.5 and GPT-6 Luna?
Neither lists a permanent free tier. Look for trials or usage-based pricing to test on real work first.