Claude Haiku 4.5 vs Gemini 3 Flash for legal writing: which is better in 2026?
A head-to-head look at Claude Haiku 4.5 and Gemini 3 Flash for legal writing. Benchmarks via artificialanalysis.ai, pricing as of May 2026. Compare AI models like these inside Admix.
Quick verdict
For legal writing in May 2026, Gemini 3 Flash edges out Claude Haiku 4.5 on the contextWindow metric. Fastest mainstream model.
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 legal writing
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 legal writing:
- 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 legal writing?
On May 2026 benchmarks (artificialanalysis.ai), Gemini 3 Flash ranks higher than Claude Haiku 4.5 for legal writing on the contextWindow 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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