Grok 4 vs Claude Haiku 4.5 for reasoning: which is better in 2026?

A head-to-head look at Grok 4 and Claude Haiku 4.5 for reasoning. Benchmarks via artificialanalysis.ai, pricing as of May 2026. Compare AI models like these inside Admix.

Quick verdict

For reasoning in May 2026, Grok 4 edges out Claude Haiku 4.5 on the intelligenceIndex metric. Fastest tokens per second among flagships.

Side-by-side specs

Spec	Grok	Haiku
Intelligence index	73.9	65.8
Coding index	70.2	66.2
Context window	256K tokens	500K tokens
Speed (tok/s)	198	205
Input $/M	$3.00	$0.80
Output $/M	$15.00	$4.00
Released	Jan 22, 2026	Mar 19, 2026

How they handle reasoning

Grok 4: Fastest tokens per second among flagships. The main caveat is behind on coding benchmarks.

Claude Haiku 4.5: Cheap Claude quality for everyday tasks. The main caveat is not as strong as opus on agentic coding.

Cost per 1,000 queries

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

Grok 4: $16.50 per 1,000 queries
Claude Haiku 4.5: $4.40 per 1,000 queries

Verdict by sub-task

Best raw quality on reasoning:
Best price: Claude Haiku 4.5
Longest context: Claude Haiku 4.5
Fastest: Claude Haiku 4.5

FAQ

Is Grok 4 better than Claude Haiku 4.5 for reasoning?

On May 2026 benchmarks (artificialanalysis.ai), Grok 4 ranks higher than Claude Haiku 4.5 for reasoning on the intelligenceIndex metric. The gap is small enough that the choice often comes down to price, context length, and tone.

Which is cheaper, Grok 4 or Claude Haiku 4.5?

Grok 4 costs $3.00 input and $15.00 output per million tokens. Claude Haiku 4.5 costs $0.80 input and $4.00 output per million tokens.

Can I use both Grok and Haiku in one app?

Yes. Admix is a multi model AI chat aggregator that lets you run Grok 4 and Claude Haiku 4.5 side by side under one subscription.

Sources

Benchmarks from artificialanalysis.ai (May 2026).

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