GPT-5 Mini vs Claude Haiku 4.5 for email drafting: which is better in 2026?

A head-to-head look at GPT-5 Mini and Claude Haiku 4.5 for email drafting. Benchmarks via artificialanalysis.ai, pricing as of May 2026. Compare AI models like these inside Admix.

Quick verdict

For email drafting in May 2026, GPT-5 Mini edges out Claude Haiku 4.5 on the inputPricePerMTok metric. Cheap and fast enough to embed in every inbox.

Side-by-side specs

Spec	GPT-5 Mini	Haiku
Intelligence index	64.5	65.8
Coding index	61.0	66.2
Context window	200K tokens	500K tokens
Speed (tok/s)	220	205
Input $/M	$0.25	$0.80
Output $/M	$1.00	$4.00
Released	Sep 10, 2025	Mar 19, 2026

How they handle email drafting

GPT-5 Mini: Cheap and fast enough to embed in every inbox.

Claude Haiku 4.5: Best tone-to-price ratio for client-facing email.

Cost per 1,000 queries

Assuming 1,500 input and 800 output tokens per query:

GPT-5 Mini: $1.18 per 1,000 queries
Claude Haiku 4.5: $4.40 per 1,000 queries

Verdict by sub-task

Best raw quality on email drafting:
Best price: GPT-5 Mini
Longest context: Claude Haiku 4.5
Fastest: GPT-5 Mini

FAQ

Is GPT-5 Mini better than Claude Haiku 4.5 for email drafting?

On May 2026 benchmarks (artificialanalysis.ai), GPT-5 Mini ranks higher than Claude Haiku 4.5 for email drafting on the inputPricePerMTok metric. The gap is small enough that the choice often comes down to price, context length, and tone.

Which is cheaper, GPT-5 Mini or Claude Haiku 4.5?

GPT-5 Mini costs $0.25 input and $1.00 output per million tokens. Claude Haiku 4.5 costs $0.80 input and $4.00 output per million tokens.

Can I use both GPT-5 Mini and Haiku in one app?

Yes. Admix is a multi model AI chat aggregator that lets you run GPT-5 Mini and Claude Haiku 4.5 side by side under one subscription.

Sources

Benchmarks from artificialanalysis.ai (May 2026).

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