Claude Haiku 4.5 vs Gemini 3 Flash for react: which is better in 2026?

A head-to-head look at Claude Haiku 4.5 and Gemini 3 Flash for react. Benchmarks via artificialanalysis.ai, pricing as of May 2026. Compare AI models like these inside Admix.

Quick verdict

For react in May 2026, Claude Haiku 4.5 edges out Gemini 3 Flash on the codingIndex metric. Cheap Claude quality for everyday tasks.

Side-by-side specs

Spec	Haiku	Flash
Intelligence index	65.8	63.2
Coding index	66.2	60.5
Context window	500K tokens	1M tokens
Speed (tok/s)	205	260
Input $/M	$0.80	$0.15
Output $/M	$4.00	$0.60
Released	Mar 19, 2026	Feb 12, 2026

How they handle react

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

Gemini 3 Flash: Fastest mainstream model. The main caveat is weaker on nuanced reasoning.

Cost per 1,000 queries

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

Claude Haiku 4.5: $4.40 per 1,000 queries
Gemini 3 Flash: $0.70 per 1,000 queries

Verdict by sub-task

Best raw quality on react:
Best price: Gemini 3 Flash
Longest context: Gemini 3 Flash
Fastest: Gemini 3 Flash

FAQ

Is Claude Haiku 4.5 better than Gemini 3 Flash for react?

On May 2026 benchmarks (artificialanalysis.ai), Claude Haiku 4.5 ranks higher than Gemini 3 Flash for react on the codingIndex metric. The gap is small enough that the choice often comes down to price, context length, and tone.

Which is cheaper, Claude Haiku 4.5 or Gemini 3 Flash?

Claude Haiku 4.5 costs $0.80 input and $4.00 output per million tokens. Gemini 3 Flash costs $0.15 input and $0.60 output per million tokens.

Can I use both Haiku and Flash in one app?

Yes. Admix is a multi model AI chat aggregator that lets you run Claude Haiku 4.5 and Gemini 3 Flash side by side under one subscription.

Sources

Benchmarks from artificialanalysis.ai (May 2026).

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