Llama 4 405B vs Mistral Large 3 for javascript: which is better in 2026?

A head-to-head look at Llama 4 405B and Mistral Large 3 for javascript. Benchmarks via artificialanalysis.ai, pricing as of May 2026. Compare AI models like these inside Admix.

Quick verdict

For javascript in May 2026, Llama 4 405B edges out Mistral Large 3 on the codingIndex metric. Best fully open-weights model.

Side-by-side specs

Spec	Llama	Mistral
Intelligence index	71.5	69.8
Coding index	69.0	67.4
Context window	256K tokens	256K tokens
Speed (tok/s)	95	115
Input $/M	$0.90	$2.00
Output $/M	$2.70	$6.00
Released	Nov 5, 2025	Jan 14, 2026

How they handle javascript

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

Mistral Large 3: EU data residency options. The main caveat is behind us labs on raw benchmarks.

Cost per 1,000 queries

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

Llama 4 405B: $3.51 per 1,000 queries
Mistral Large 3: $7.80 per 1,000 queries

Verdict by sub-task

Best raw quality on javascript:
Best price: Llama 4 405B
Longest context: Llama 4 405B
Fastest: Mistral Large 3

FAQ

Is Llama 4 405B better than Mistral Large 3 for javascript?

On May 2026 benchmarks (artificialanalysis.ai), Llama 4 405B ranks higher than Mistral Large 3 for javascript on the codingIndex 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 Mistral Large 3?

Llama 4 405B costs $0.90 input and $2.70 output per million tokens. Mistral Large 3 costs $2.00 input and $6.00 output per million tokens.

Can I use both Llama and Mistral in one app?

Yes. Admix is a multi model AI chat aggregator that lets you run Llama 4 405B and Mistral Large 3 side by side under one subscription.

Sources

Benchmarks from artificialanalysis.ai (May 2026).

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