Llama 4 405B vs Claude Haiku 4.5 for legal writing: which is better in 2026?
A head-to-head look at Llama 4 405B and Claude Haiku 4.5 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, Claude Haiku 4.5 edges out Llama 4 405B on the contextWindow metric. Cheap Claude quality for everyday tasks.
Side-by-side specs
| Spec | Llama | Haiku |
|---|---|---|
| Intelligence index | 71.5 | 65.8 |
| Coding index | 69.0 | 66.2 |
| Context window | 256K tokens | 500K tokens |
| Speed (tok/s) | 95 | 205 |
| Input $/M | $0.90 | $0.80 |
| Output $/M | $2.70 | $4.00 |
| Released | Nov 5, 2025 | Mar 19, 2026 |
How they handle legal writing
Llama 4 405B: Best fully open-weights model. The main caveat is trails closed flagships on coding.
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:
- Llama 4 405B: $3.51 per 1,000 queries
- Claude Haiku 4.5: $4.40 per 1,000 queries
Verdict by sub-task
- Best raw quality on legal writing:
- Best price: Claude Haiku 4.5
- Longest context: Claude Haiku 4.5
- Fastest: Claude Haiku 4.5
FAQ
Is Llama 4 405B better than Claude Haiku 4.5 for legal writing?
On May 2026 benchmarks (artificialanalysis.ai), Claude Haiku 4.5 ranks higher than Llama 4 405B 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, Llama 4 405B or Claude Haiku 4.5?
Llama 4 405B costs $0.90 input and $2.70 output per million tokens. Claude Haiku 4.5 costs $0.80 input and $4.00 output per million tokens.
Can I use both Llama and Haiku in one app?
Yes. Admix is a multi model AI chat aggregator that lets you run Llama 4 405B and Claude Haiku 4.5 side by side under one subscription.
Sources
Benchmarks from artificialanalysis.ai (May 2026).
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