Claude Haiku 5.5 vs GPT-6 Luna.
Claude Haiku 5.5 is 1.0x cheaper.

For a chatbot doing 100K requests a month with 1,000 input and 500 output tokens each: $35.00 vs $35.00.

Anthropic

Claude Haiku 5.5

Input / 1M$0.10
Cached / 1M$0.01
Output / 1M$0.50
Context—
Chatbot at 100K req/mo$35.00

Source · Oct 20, 2026

OpenAI

GPT-6 Luna

Input / 1M$0.10
Cached / 1M$0.01
Output / 1M$0.50
Context—
Chatbot at 100K req/mo$35.00

Source · Oct 20, 2026

Price isn't everything: check quality on your own prompts. Claude Haiku 5.5 wins on list price for this workload, but output-heavy jobs (long answers, agents, reasoning) shift the math toward whichever model has the lower output price. Here both charge the same for output.

Run your own workload