DeepSeek-V2.5 vs Mercury 3
Mercury 3 leads the LLM Stats Score 36.1 to 7.6. Mercury 3 is 1.1x cheaper per token.
DeepSeek · Inception · Updated for 2026
Which is better?
Mercury 3 leads the overall LLM Stats Score 36.1 to 7.6, ranking #98 overall.
On price, Mercury 3 is roughly 1.1x 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 DeepSeek-V2.5
- 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
- cost matters — it's about 1.1x cheaper per token
- 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
15 reported for DeepSeek-V2.5 · 12 for Mercury 3
DeepSeek-V2.5 and Mercury 3don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, DeepSeek-V2.5 ($0.14/1M tokens) is 1.4x more expensive than Mercury 3 ($0.10/1M tokens).
For output processing, DeepSeek-V2.5 ($0.28/1M tokens) is 1.2x cheaper than Mercury 3 ($0.35/1M tokens).
In conclusion, DeepSeek-V2.5 is more expensive than Mercury 3.*
* 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 DeepSeek-V2.5's 8,192 tokens. Mercury 3 can generate longer responses up to 131,072 tokens, while DeepSeek-V2.5 is limited to 8,192 tokens.
License
Usage and distribution terms
DeepSeek-V2.5 is licensed under deepseek, while Mercury 3 uses a proprietary license.
License differences may affect how you can use these models in commercial or open-source projects.
deepseek
Open weights
Proprietary
Closed source
Release Timeline
When each model was launched
DeepSeek-V2.5 was released on 2024-05-08, while Mercury 3 was released on 2026-10-19.
Mercury 3 is 30 months newer than DeepSeek-V2.5.
May 8, 2024
2.5 years ago
Oct 19, 2026
1 days ago
2.4yr newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
DeepSeek-V2.5 is available from DeepSeek, DeepInfra, Hyperbolic. Mercury 3 is available from Inception.
DeepSeek-V2.5
Mercury 3
Outputs Comparison
Judge for yourself.
Run your own prompts against DeepSeek-V2.5 and Mercury 3 side-by-side, then vote on the output you prefer.
FAQ
Common questions about DeepSeek-V2.5 vs Mercury 3.