Model comparison
Granite 4.2 8B vs Mercury 2.5
Granite 4.2 8B has enough public results to be ranked (#143); Mercury 2.5 does not yet, so treat this comparison as directional.
Last verified . 0 shared benchmarks.
Summary
- Mercury 2.5 is cheaper at $0.04 / $0.15 per million input/output tokens, against $0.06 / $0.25 for Granite 4.2 8B.
- Mercury 2.5 accepts more context: 260K tokens versus 131K.
- Granite 4.2 8B has downloadable open weights; the other is API-only.
Side by side
| Granite 4.2 8B | Mercury 2.5 | |
|---|---|---|
| Provider | IBM | Inception |
| Noometry Index | 40.0 | 30.2 |
| Released | — | 2026-09-08 |
| Weights | Open | Proprietary |
| Context window | 131K | 260K |
| Max output | 118K | 66K |
| Input $ / M tokens | $0.06 | $0.04 |
| Output $ / M tokens | $0.25 | $0.15 |
| Results tracked | 11 | 2 |
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Category by category
Coding Not comparable
Granite 4.2 8B: 39.9 (#138), Mercury 2.5: —
| Benchmark | Granite 4.2 8B | Mercury 2.5 |
|---|---|---|
| LMArena Coding | 1379 | — |
| ALE-Bench | — | 301.65 |
Reasoning Not comparable
Granite 4.2 8B: 25.5 (#130), Mercury 2.5: —
| Benchmark | Granite 4.2 8B | Mercury 2.5 |
|---|---|---|
| LMArena Hard Prompts | 1327 | — |
Math Not comparable
Granite 4.2 8B: —, Mercury 2.5: 22.4
| Benchmark | Granite 4.2 8B | Mercury 2.5 |
|---|---|---|
| ProofBench | — | 3% |
Knowledge Not comparable
Granite 4.2 8B: 37.7 (#144), Mercury 2.5: —
| Benchmark | Granite 4.2 8B | Mercury 2.5 |
|---|---|---|
| LMArena Expert | 1380 | — |
Multilingual Not comparable
Granite 4.2 8B: 44.5 (#173), Mercury 2.5: —
| Benchmark | Granite 4.2 8B | Mercury 2.5 |
|---|---|---|
| LMArena Non-English | 1299 | — |
| LMArena Chinese | 1361 | — |
| LMArena Russian | 1283 | — |
Instruction Following Not comparable
Granite 4.2 8B: 68.7 (#183), Mercury 2.5: —
| Benchmark | Granite 4.2 8B | Mercury 2.5 |
|---|---|---|
| LMArena Instruction Following | 1298 | — |
Long Context Not comparable
Granite 4.2 8B: 40.2 (#154), Mercury 2.5: —
| Benchmark | Granite 4.2 8B | Mercury 2.5 |
|---|---|---|
| LMArena Longer Query | 1323 | — |
Writing & Preference Not comparable
Granite 4.2 8B: 49.8 (#183), Mercury 2.5: —
| Benchmark | Granite 4.2 8B | Mercury 2.5 |
|---|---|---|
| LMArena Text | 1319 | — |
| LMArena Creative Writing | 1238 | — |
| LMArena Multi-Turn | 1299 | — |
Frequently asked questions
Is Granite 4.2 8B better than Mercury 2.5?
Granite 4.2 8B has enough public results to be ranked (#143); Mercury 2.5 does not yet, so treat this comparison as directional.
Which is cheaper, Granite 4.2 8B or Mercury 2.5?
Mercury 2.5 is cheaper. It lists at $0.04 per million input tokens and $0.15 per million output tokens; Granite 4.2 8B lists at $0.06 and $0.25.
Which has the bigger context window?
Mercury 2.5 does, with 260K tokens against 131K.
How many benchmarks do Granite 4.2 8B and Mercury 2.5 share?
0 benchmarks have published results for both models. Granite 4.2 8B has 11 scored results on Noometry and Mercury 2.5 has 2.