GPT-6 Luna vs Claude Haiku 5.5: scores, price and which to pick

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Our take

Claude Haiku 5.5 wins 3 of 4 categories.

Overall3744Best

Coding4852Best

Writing31Best24

Support3134Best

Value4250Best

Input / 1M$0.10$0.10

Output / 1M$0.50$0.50

Blended / 1M$0.20$0.20

Context window1.1MBest1M

Open weightsNoNo

Released22 Sept 20267 Oct 2026

Your monthly bill

Tasks per month50k

GPT-6 Luna$40.00Cheapest

Claude Haiku 5.5$40.00Cheapest

List prices, a quarter of the tokens as output. Scores are provisional, from Arena and Epoch AI.