Llama 4 405B vs GPT-5 Mini for legal writing: which is better in 2026?

A head-to-head look at Llama 4 405B and GPT-5 Mini 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, Llama 4 405B edges out GPT-5 Mini on the contextWindow metric. Best fully open-weights model.

Side-by-side specs

Spec	Llama	GPT-5 Mini
Intelligence index	71.5	64.5
Coding index	69.0	61.0
Context window	256K tokens	200K tokens
Speed (tok/s)	95	220
Input $/M	$0.90	$0.25
Output $/M	$2.70	$1.00
Released	Nov 5, 2025	Sep 10, 2025

How they handle legal writing

Llama 4 405B: Best fully open-weights model. The main caveat is trails closed flagships on coding.

GPT-5 Mini: Excellent quality-to-price ratio. The main caveat is behind flagships on hard reasoning.

Cost per 1,000 queries

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

Llama 4 405B: $3.51 per 1,000 queries
GPT-5 Mini: $1.18 per 1,000 queries

Verdict by sub-task

Best raw quality on legal writing:
Best price: GPT-5 Mini
Longest context: Llama 4 405B
Fastest: GPT-5 Mini

FAQ

Is Llama 4 405B better than GPT-5 Mini for legal writing?

On May 2026 benchmarks (artificialanalysis.ai), Llama 4 405B ranks higher than GPT-5 Mini 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 GPT-5 Mini?

Llama 4 405B costs $0.90 input and $2.70 output per million tokens. GPT-5 Mini costs $0.25 input and $1.00 output per million tokens.

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

Yes. Admix is a multi model AI chat aggregator that lets you run Llama 4 405B and GPT-5 Mini side by side under one subscription.

Sources

Benchmarks from artificialanalysis.ai (May 2026).

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