Gemini 4 Argon
Claude Opus 5.5
Muse Wonder
MiMo-V2.6-Pro
Qwen3.8-Max
Kimi K3
GLM-5.3
GPT-5.5
ERNIE 5.1
DeepSeek-V4.1-Flash-20260910
Grok 4.20 Beta
amazon-nova-experimental-chat
Dola Seed 2.0 Pro
NVIDIA-Nemotron-3-Ultra-550B-A55B
Gemma 4 31B
Step 5 Preview
Mercury 2
Mercury 2 is a proprietary model from Inception, released Mar 4, 2026. It ranks #204 of 351 on the LMArena text leaderboard with a rating of 1355. It costs $0.25 per million input tokens and $0.75 per million output tokens, with a 125K-token context window.
- Developer
- Inception
- Released
- Mar 4, 2026
- Context window
- 125K
- Price in / out, per 1M tokens
- $0.25 / $0.75
- Weights
- Proprietary
- Inputs
- Text
- Reasoning
- Yes
- Tool use
- Yes
The rating LMArena published at each update since Mar 11, 2026. Ratings move as votes come in and new models join.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1355 | 204 / 351 | 3.2K |
| CodingLMArena | 1390 | 184 / 346 | 800 |
| Creative writingLMArena | 1289 | 230 / 349 | 547 |
| Instruction followingLMArena | 1327 | 208 / 351 | 885 |
| Hard promptsLMArena | 1361 | 201 / 351 | 1.8K |
| Multi-turnLMArena | 1357 | 197 / 349 | 551 |
| Long queriesLMArena | 1330 | 216 / 330 | 918 |
| ExpertLMArena | 1358 | 193 / 305 | 253 |
| Medicine and healthcareIndustries | 1363 | 198 / 325 | 231 |
| Business and financeIndustries | 1349 | 193 / 344 | 512 |
| ChineseLanguages | 1417 | 170 / 328 | 233 |
| WebDevLMArena | 1171 | 147 / 124 | 954 |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown.
Compare Mercury 2
Inception
Builds Mercury, diffusion language models that generate text in parallel. Founded 2024, based in Palo Alto. inceptionlabs.ai
Questions
Who makes Mercury 2?
Mercury 2 is made by Inception, founded 2024 and based in Palo Alto.
How much does Mercury 2 cost?
$0.25 per million input tokens and $0.75 per million output tokens, at its provider’s list price.
What is Mercury 2’s context window?
125K tokens (128,000).
How does Mercury 2 rank?
#204 of 351 on LMArena’s text leaderboard, rated 1355 (95% interval 1344–1365) from 3,193 votes, as of Oct 22, 2026.
Is Mercury 2 open source?
No. Mercury 2 is proprietary and served through its provider’s API.