Model comparison
Grok 4.5 vs Mellum2-12B-A2.5B-Instruct
Head-to-head evidence from 0 shared benchmark results across 0 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
BenchAlign evidence: Grok 4.5 supported; Mellum2-12B-A2.5B-Instruct not scored. Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Grok 4.5 and Mellum2-12B-A2.5B-Instruct share 0 comparable benchmark results. 0 of 8 categories are comparable. 27 results are unique to Grok 4.5; 6 to Mellum2-12B-A2.5B-Instruct.
Updated July 16, 2026- Shared results
- 0
- Grok 4.5 only
- 27
- Mellum2-12B-A2.5B-Instruct only
- 6
- Comparable categories
- 0 / 8
Benchmark data for Grok 4.5 and Mellum2-12B-A2.5B-Instruct is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 0 shared benchmark results across 0 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
Grok 4.5 has the larger context window at 500K, compared with 128K for Mellum2-12B-A2.5B-Instruct.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Grok 4.5 | Mellum2-12B-A2.5B-Instruct | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Grok 4.5$2 input / $6 output | Mellum2-12B-A2.5B-InstructNot available | A complete price comparison is not available. |
| Generation speedtokens per second | Grok 4.5Not available | Mellum2-12B-A2.5B-InstructNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Grok 4.5Not available | Mellum2-12B-A2.5B-InstructNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Grok 4.5500K | Mellum2-12B-A2.5B-Instruct128K | Grok 4.5 lists the larger context window. |
Benchmark Deep Dive
Agentic11 benchmarks
| Benchmark | Grok 4.5 | Mellum2-12B-A2.5B-Instruct | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 83.3% | — | Not comparable |
| deepSweSource | 53% | — | Not comparable |
| AA Agentic IndexSource | 45.7% | — | Not comparable |
| GDPval-AASource | 51.9% | — | Not comparable |
| GDPval-AASource | 1539 | — | Not comparable |
| AA BriefcaseSource | 1324 | — | Not comparable |
| AA AutomationBenchSource | 51.4% | — | Not comparable |
| AA EnterpriseOps-GymSource | 40.8% | — | Not comparable |
| AA Harvey LABSource | 13.3% | — | Not comparable |
| AA Tau3 BankingSource | 32.6% | — | Not comparable |
| BFCL v4Source | — | 44.2% | Not comparable |
Coding8 benchmarks
| Benchmark | Grok 4.5 | Mellum2-12B-A2.5B-Instruct | Result |
|---|---|---|---|
| SWE-bench ProSource | 64.7% | — | Not comparable |
| SWE MultilingualSource | 78% | — | Not comparable |
| Terminal-Bench 2.0Source | 83.3% | — | Not comparable |
| cursorBench32Source | 66.7% | — | Not comparable |
| AA Coding IndexSource | 72.5% | — | Not comparable |
| AA-SciCodeSource | 54.1% | — | Not comparable |
| AA Terminal-Bench 2.1Source | 81.6% | — | Not comparable |
| LiveCodeBench v6Source | — | 37.2% | Not comparable |
Reasoning2 benchmarks
Knowledge9 benchmarks
| Benchmark | Grok 4.5 | Mellum2-12B-A2.5B-Instruct | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 53.8% | — | Not comparable |
| AA-GPQA DiamondSource | 93.1% | — | Not comparable |
| AA-HLESource | 40.3% | — | Not comparable |
| AA-Omniscience IndexSource | 26.4% | — | Not comparable |
| AA-Omniscience AccuracySource | 52.1% | — | Not comparable |
| AA-Omniscience Hallucination RateSource | 53.5% | — | Not comparable |
| MMLU-ReduxSource | — | 78.1% | Not comparable |
| GPQASource | — | 40.9% | Not comparable |
| GPQA-DSource | — | 40.9% | Not comparable |
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | Grok 4.5 | Mellum2-12B-A2.5B-Instruct | Result |
|---|---|---|---|
| IFEvalSource | — | 75.8% | Not comparable |
Frequently Asked Questions (3)
Can I compare Grok 4.5 and Mellum2-12B-A2.5B-Instruct on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for Grok 4.5 and Mellum2-12B-A2.5B-Instruct today?
Grok 4.5: $2.00 input / $6.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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