Llama 3.1 8B Instruct vs Mercury 3
Mercury 3 leads the LLM Stats Score 36.1 to -3.1. Llama 3.1 8B Instruct is 7.2x cheaper per token.
Meta · Inception · Updated for 2026
Which is better?
Mercury 3 leads the overall LLM Stats Score 36.1 to -3.1, ranking #98 overall.
In the 1 individual benchmarks reported for both models, Mercury 3 wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, Llama 3.1 8B Instruct is roughly 7.2x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Mercury 3 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Llama 3.1 8B Instruct
- cost matters — it's about 7.2x cheaper per token
- you need open weights you can self-host or fine-tune
Choose Mercury 3
- overall performance matters — it scores 36.1 and ranks #98 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- you process long inputs — it offers a 1,000,000 token context window
- you want the most recent training data — it shipped Oct 2026
At a glance
The differences that matter most.
Individual benchmarks
18 reported for Llama 3.1 8B Instruct · 12 for Mercury 3
Llama 3.1 8B Instruct outperforms in 0 benchmarks, while Mercury 3 is better at 1 benchmark (GPQA).
Mercury 3 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Llama 3.1 8B Instruct ($0.02/1M tokens) is 5.0x cheaper than Mercury 3 ($0.10/1M tokens).
For output processing, Llama 3.1 8B Instruct ($0.03/1M tokens) is 11.7x cheaper than Mercury 3 ($0.35/1M tokens).
In conclusion, Mercury 3 is more expensive than Llama 3.1 8B Instruct.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Mercury 3 accepts 1,000,000 input tokens compared to Llama 3.1 8B Instruct's 131,072 tokens. Both models can generate responses up to 131,072 tokens.
License
Usage and distribution terms
Llama 3.1 8B Instruct is licensed under Llama 3.1 Community License, while Mercury 3 uses a proprietary license.
License differences may affect how you can use these models in commercial or open-source projects.
Llama 3.1 Community License
Open weights
Proprietary
Closed source
Release Timeline
When each model was launched
Llama 3.1 8B Instruct was released on 2024-07-23, while Mercury 3 was released on 2026-10-19.
Mercury 3 is 27 months newer than Llama 3.1 8B Instruct.
Jul 23, 2024
2.2 years ago
Oct 19, 2026
3 days ago
2.2yr newerKnowledge Cutoff
When training data ends
Llama 3.1 8B Instruct has a documented knowledge cutoff of 2023-12-31, while Mercury 3's cutoff date is not specified.
We can confirm Llama 3.1 8B Instruct's training data extends to 2023-12-31, but cannot make a direct comparison without Mercury 3's cutoff date.
Dec 2023
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Provider Availability
Llama 3.1 8B Instruct is available from DeepInfra, Lambda, Groq, Sambanova, Cerebras, Hyperbolic, Together, Fireworks, Bedrock. Mercury 3 is available from Inception.
Llama 3.1 8B Instruct
Mercury 3
Outputs Comparison
Judge for yourself.
Run your own prompts against Llama 3.1 8B Instruct and Mercury 3 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Llama 3.1 8B Instruct vs Mercury 3.