Model comparison
Grok Build 0.1 vs Mercury 2
Mercury 2 is the stronger model overall, scoring 39.1 to 36.4 on the Noometry Index.
Last verified . 2 shared benchmarks.
Summary
- They share 2 benchmarks with published results for both. Grok Build 0.1 scores higher in 2 categories and Mercury 2 in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in coding, where Grok Build 0.1 leads 43.1 to 33.5.
- The biggest single-benchmark swing is SciCode: 50.2% for Grok Build 0.1 and 38.7% for Mercury 2.
- Mercury 2 is cheaper at $0.25 / $0.75 per million input/output tokens, against $1 / $2 for Grok Build 0.1.
- Grok Build 0.1 accepts more context: 256K tokens versus 128K.
Side by side
| Grok Build 0.1 | Mercury 2 | |
|---|---|---|
| Provider | xAI | Inception |
| Noometry Index | 36.4 | 39.1 |
| Released | 2026-04-16 | 2026-02-20 |
| Weights | Proprietary | Proprietary |
| Context window | 256K | 128K |
| Max output | 256K | 50K |
| Input $ / M tokens | $1 | $0.25 |
| Output $ / M tokens | $2 | $0.75 |
| Results tracked | 3 | 17 |
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Category by category
Coding Grok Build 0.1 leads
Grok Build 0.1: 43.1 (#91), Mercury 2: 33.5 (#255)
| Benchmark | Grok Build 0.1 | Mercury 2 |
|---|---|---|
| SciCode | 50.2% | 38.7% |
| LMArena WebDev | — | 1171 |
| WeirdML | — | 43.2% |
| LMArena Coding | — | 1391 |
| ALE-Bench | — | 785.58 |
Agentic & Tool Use Not comparable
Grok Build 0.1: 22.7 (#129), Mercury 2: —
| Benchmark | Grok Build 0.1 | Mercury 2 |
|---|---|---|
| GBAEval | 2.4% | — |
Reasoning Grok Build 0.1 leads
Grok Build 0.1: 32.2 (#77), Mercury 2: 23.8 (#170)
| Benchmark | Grok Build 0.1 | Mercury 2 |
|---|---|---|
| CritPt | 9.1% | 0.8% |
| LMArena Hard Prompts | — | 1362 |
Knowledge Not comparable
Grok Build 0.1: —, Mercury 2: 36.2 (#172)
| Benchmark | Grok Build 0.1 | Mercury 2 |
|---|---|---|
| Vectara Hallucination Rate | — | 12.3% |
| LMArena Expert | — | 1358 |
Multilingual Not comparable
Grok Build 0.1: —, Mercury 2: 46.6 (#157)
| Benchmark | Grok Build 0.1 | Mercury 2 |
|---|---|---|
| LMArena Non-English | — | 1331 |
| LMArena Chinese | — | 1417 |
| LMArena Russian | — | 1304 |
Instruction Following Not comparable
Grok Build 0.1: —, Mercury 2: 70.2 (#165)
| Benchmark | Grok Build 0.1 | Mercury 2 |
|---|---|---|
| LMArena Instruction Following | — | 1329 |
Long Context Not comparable
Grok Build 0.1: —, Mercury 2: 40.5 (#154)
| Benchmark | Grok Build 0.1 | Mercury 2 |
|---|---|---|
| LMArena Longer Query | — | 1330 |
Writing & Preference Not comparable
Grok Build 0.1: —, Mercury 2: 53.8 (#155)
| Benchmark | Grok Build 0.1 | Mercury 2 |
|---|---|---|
| LMArena Text | — | 1355 |
| LMArena Creative Writing | — | 1289 |
| LMArena Multi-Turn | — | 1358 |
Frequently asked questions
Is Grok Build 0.1 better than Mercury 2?
Mercury 2 is the stronger model overall, scoring 39.1 to 36.4 on the Noometry Index.
Which is cheaper, Grok Build 0.1 or Mercury 2?
Mercury 2 is cheaper. It lists at $0.25 per million input tokens and $0.75 per million output tokens; Grok Build 0.1 lists at $1 and $2.
Is Grok Build 0.1 or Mercury 2 better for coding?
Grok Build 0.1 scores higher on coding benchmarks: 43.1 versus 33.5 in the Noometry coding category.
Which has the bigger context window?
Grok Build 0.1 does, with 256K tokens against 128K.
How many benchmarks do Grok Build 0.1 and Mercury 2 share?
2 benchmarks have published results for both models. Grok Build 0.1 has 3 scored results on Noometry and Mercury 2 has 17.