Is Claude 4.5 Haiku or GPT-4o cheaper?

For a typical request (10,000 input + 2,000 output tokens), Claude 4.5 Haiku is cheaper — about 56% less, or roughly $2500 saved per 100,000 requests. Claude 4.5 Haiku runs $1/$5 per 1M input/output tokens; GPT-4o runs $2.5/$10.

Which has the larger context window?

Claude 4.5 Haiku, at 200,000 tokens versus 128,000.

How accurate are these token counts?

Claude 4.5 Haiku: Approximated with cl100k_base — drift typically <2% on English and code. GPT-4o: Exact tokenization via the canonical OpenAI vocab (o200k_base). The dollar math itself is exact once the token count is known.

Claude 4.5 Haiku vs GPT-4o: pricing & cost comparison

On input tokens, Claude 4.5 Haiku is the cheaper of the two — 60% less per million ($1 vs $2.5). On output, Claude 4.5 Haiku is 50% cheaper ($5 vs $10) — and since output is usually the dominant cost driver, that gap matters more than it looks.

Side by side

	Claude 4.5 Haiku	GPT-4o
Input / 1M tokens	$1	$2.5
Output / 1M tokens	$5	$10
Context window	200,000	128,000
Token-count accuracy	±2%	exact
Cost — 10,000 input + 2,000 output tokens	$0.02	$0.045

What a real request costs

Take a representative turn — 10,000 input + 2,000 output tokens. Claude 4.5 Haiku comes to $0.02, GPT-4o to $0.045. Across 100,000 requests that's a $2500 swing in favour of Claude 4.5 Haiku. To run the numbers on your actual prompt, paste it into the calculator and toggle Compare across all models.

Close call — decide on output cost

Claude 4.5 Haiku and GPT-4o are close enough on price that the tie-breakers matter more than the headline rate. Output tokens are usually the dominant cost driver, so weigh $5 vs $10 per 1M output first, then context window — Claude 4.5 Haiku carries the larger one at 200,000 tokens. They're different vendors, so factor in a small tokenizer calibration buffer on whichever side isn't exact.

See the full breakdown on the dedicated pages for Claude 4.5 Haiku and GPT-4o.

FAQ

Is Claude 4.5 Haiku or GPT-4o cheaper?: For a typical request (10,000 input + 2,000 output tokens), Claude 4.5 Haiku is cheaper — about 56% less, or roughly $2500 saved per 100,000 requests. Claude 4.5 Haiku runs $1/$5 per 1M input/output tokens; GPT-4o runs $2.5/$10.
Which has the larger context window?: Claude 4.5 Haiku, at 200,000 tokens versus 128,000.
How accurate are these token counts?: Claude 4.5 Haiku: Approximated with cl100k_base — drift typically <2% on English and code. GPT-4o: Exact tokenization via the canonical OpenAI vocab (o200k_base). The dollar math itself is exact once the token count is known.

Both prices are computed from tokenmath's verified pricing table. Rates sourced from www.anthropic.com and openai.com, verified 2026-05-18. Vendor pricing changes often — confirm before you commit.