Is Claude 4.5 Haiku or GPT-4o mini cheaper?

For a typical request (10,000 input + 2,000 output tokens), GPT-4o mini is cheaper — about 87% less, or roughly $1730 saved per 100,000 requests. Claude 4.5 Haiku runs $1/$5 per 1M input/output tokens; GPT-4o mini runs $0.15/$0.6.

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 mini: 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 mini: pricing & cost comparison

On input tokens, GPT-4o mini is the cheaper of the two — 85% less per million ($1 vs $0.15). On output, GPT-4o mini is 88% cheaper ($5 vs $0.6) — 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 mini
Input / 1M tokens	$1	$0.15
Output / 1M tokens	$5	$0.6
Context window	200,000	128,000
Token-count accuracy	±2%	exact
Cost — 10,000 input + 2,000 output tokens	$0.02	$0.0027

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 mini to $0.0027. Across 100,000 requests that's a $1730 swing in favour of GPT-4o mini. To run the numbers on your actual prompt, paste it into the calculator and toggle Compare across all models.

Different leagues

These two sit in different price tiers — Claude 4.5 Haiku runs roughly 7× the per-request cost of GPT-4o mini on the worked example — so they rarely compete for the same job. Reach for GPT-4o mini on high-volume, latency-sensitive work (classification, extraction, routing) and Claude 4.5 Haiku only where the harder reasoning earns its price. They're different vendors, so expect a different API and tokenizer: the OpenAI side counts exactly; the other lands within a few percent — budget a small calibration buffer when you switch.

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

FAQ

Is Claude 4.5 Haiku or GPT-4o mini cheaper?: For a typical request (10,000 input + 2,000 output tokens), GPT-4o mini is cheaper — about 87% less, or roughly $1730 saved per 100,000 requests. Claude 4.5 Haiku runs $1/$5 per 1M input/output tokens; GPT-4o mini runs $0.15/$0.6.
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 mini: 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.