# Granite 4.2 8B vs Mercury 2.5

> Side-by-side benchmark comparison for Granite 4.2 8B and Mercury 2.5 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/granite-4-2-8b-vs-mercury-2-5
- Last updated: September 8, 2026

- Shared sourced benchmarks: 3
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: Granite 4.2 8B and Mercury 2.5 share only 3 sourced benchmark rows.

## Summary

- Only 3 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Granite 4.2 8B has the lower published output-token price.
- Mercury 2.5 has the larger published context window at 260K.

## Model Snapshot

| Property | Granite 4.2 8B | Mercury 2.5 |
|----------|----------|----------|
| Creator | IBM | Inception |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 128K | 260K |
| Independent public score (not head-to-head) | 39 | null |
| Benchmarks Covered | 14 | 5 |
| Pricing (input/output) | $0.00 / $0.00 | $0.04 / $0.15 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Granite 4.2 8B public-lane score: 32.1 (Estimated · #138/152)
- Mercury 2.5 public-lane score: 44.5 (Estimated · #91/152)

| Benchmark | Granite 4.2 8B | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 20.6% | Coming soon | Coming soon |
| τ³-bench results | 58.1% | 96.0% | Mercury 2.5 |
| BFCL v4 | 52.4% | Coming soon | Coming soon |
| DeepSearchQA | Coming soon | 34.0% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Granite 4.2 8B public-lane score: 37.6 (Estimated · #125/151)
- Mercury 2.5 public-lane score: 47.8 (Estimated · #73/151)

| Benchmark | Granite 4.2 8B | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 47.7% | Coming soon | Coming soon |
| SWE-bench Pro | 19.1% | Coming soon | Coming soon |
| SWE Multilingual | 30.8% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 20.6% | Coming soon | Coming soon |
| LiveCodeBench v6 | 73.2% | Coming soon | Coming soon |
| SciCode | 36.1% | 38% | Mercury 2.5 |

### Reasoning

- Winner: Insufficient shared evidence
- Granite 4.2 8B public-lane score: 51.9 (Unranked · 2 rankable rows)
- Mercury 2.5 public-lane score: 67.7 (Unranked · 1 rankable row)

### Knowledge

- Winner: Insufficient shared evidence
- Granite 4.2 8B public-lane score: 34.9 (Supported · #160/182)
- Mercury 2.5 public-lane score: 48.3 (Estimated · #94/182)

| Benchmark | Granite 4.2 8B | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 64.1% | Coming soon | Coming soon |
| MMLU-Pro | 74.0% | Coming soon | Coming soon |
| GPQA-D | Coming soon | 79.0% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Granite 4.2 8B public-lane score: 84.4 (#45/121)
- Mercury 2.5 public-lane score: 80.1 (#53/121)

| Benchmark | Granite 4.2 8B | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| IFBench | 79.3% | 77% | Granite 4.2 8B |

### Mathematics

- Winner: Insufficient shared evidence
- Granite 4.2 8B public-lane score: Coming soon
- Mercury 2.5 public-lane score: Coming soon

| Benchmark | Granite 4.2 8B | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | 86.7% | Coming soon | Coming soon |
| HMMT Feb 2025 | 78.3% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between Granite 4.2 8B and Mercury 2.5?

Not yet. The models share only 3 sourced benchmark rows, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Granite 4.2 8B vs Mercury 2.5 Preview](/compare/granite-4-2-8b-vs-mercury-2-5-preview)
- [Mercury 2.5 vs Mercury 2.5 Preview](/compare/mercury-2-5-vs-mercury-2-5-preview)
- [Granite 4.2 8B vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-granite-4-2-8b)
- [Mercury 2.5 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-mercury-2-5)

## Explore More

- [Granite 4.2 8B profile](/models/granite-4-2-8b)
- [Mercury 2.5 profile](/models/mercury-2-5)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)