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Model comparison

Gemini 2.5 Pro vs GPT-OSS 120B

Data verified

Head-to-head evidence from 17 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

57.25/100
Margin
7.2pts
← winning
50.08/100
0 category wins0 category wins

Public leaderboard positions: Gemini 2.5 Pro #70 (Supported); GPT-OSS 120B #116 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Gemini 2.5 Pro and GPT-OSS 120B share 17 comparable benchmark results. 0 of 8 categories are comparable. 7 results are unique to Gemini 2.5 Pro; 10 to GPT-OSS 120B.

Updated July 20, 2026
Shared results
17
Gemini 2.5 Pro only
7
GPT-OSS 120B only
10
Comparable categories
0 / 8

Benchmark data for Gemini 2.5 Pro and GPT-OSS 120B is coming soon on BenchLM.

Confidence note. This is a partial-evidence comparison with 17 shared benchmark results across 6 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.

Gemini 2.5 Pro is priced at $1.25 input / $10.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for GPT-OSS 120B. Gemini 2.5 Pro has the larger context window at 1M, compared with 128K for GPT-OSS 120B.

Category breakdown

Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.

Category scores and score margins for Gemini 2.5 Pro and GPT-OSS 120B
CategoryGemini 2.5 ProΔGPT-OSS 120B
CodingGemini 2.5 Pro63.8MarginNo overlapGPT-OSS 120BNot measured
KnowledgeGemini 2.5 Pro27.4MarginNo overlapGPT-OSS 120BNot measured
MathGemini 2.5 Pro11.6MarginNo overlapGPT-OSS 120BNot measured

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

MetricGemini 2.5 ProGPT-OSS 120BComparison
Input / output priceUSD per 1M tokensGemini 2.5 Pro$1.25 input / $10 outputGPT-OSS 120B$0 input / $0 outputGPT-OSS 120B has the lower combined listed price.
Generation speedtokens per secondGemini 2.5 Pro117 tok/sGPT-OSS 120B262 tok/sGPT-OSS 120B has the higher measured throughput.
First-answer latencyseconds to first tokenGemini 2.5 Pro21.19 sGPT-OSS 120B0.79 sGPT-OSS 120B reaches the first token sooner.
Context windowmaximum listed tokensGemini 2.5 Pro1MGPT-OSS 120B128KGemini 2.5 Pro lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkGemini 2.5 ProGPT-OSS 120BResult
AA Agentic IndexSource 7.1%13.2%GPT-OSS 120B leads
τ²-bench resultsSource 54.1%65.8%GPT-OSS 120B leads
Gert LabsSource 42.01%29.61%Gemini 2.5 Pro leads
GDPval-AASource 8.3%15.0%GPT-OSS 120B leads
GDPval-AASource 665799GPT-OSS 120B leads
APEX-Agents-AASource —3.1%Not comparable
AA EnterpriseOps-GymSource —25.5%Not comparable
AA Harvey LABSource —0.0%Not comparable
AA ITBenchSource —5.6%Not comparable
Coding
BenchmarkGemini 2.5 ProGPT-OSS 120BResult
SWE-bench VerifiedSource 63.8%—Not comparable
Vibe Code BenchSource 0.40%—Not comparable
AA Coding IndexSource 33.3%30.4%Gemini 2.5 Pro leads
AA-SciCodeSource 42.8%38.9%Gemini 2.5 Pro leads
React Native EvalsSource —71.6%Not comparable
AA LiveCodeBenchSource —87.8%Not comparable
Reasoning
BenchmarkGemini 2.5 ProGPT-OSS 120BResult
AA-LCRSource 66.0%50.7%Gemini 2.5 Pro leads
CritPtSource 2.6%1.1%Gemini 2.5 Pro leads
Knowledge
BenchmarkGemini 2.5 ProGPT-OSS 120BResult
GPQASource 83%—Not comparable
HLESource 18.8%—Not comparable
Artificial Analysis Intelligence IndexSource 25.8%23.8%Gemini 2.5 Pro leads
AA-GPQA DiamondSource 84.4%78.2%Gemini 2.5 Pro leads
AA-HLESource 21.1%18.5%Gemini 2.5 Pro leads
AA-Omniscience IndexSource -14.3%-50.0%Gemini 2.5 Pro leads
AA-Omniscience AccuracySource 39.0%21.5%Gemini 2.5 Pro leads
AA-Omniscience Hallucination RateSource 87.4%91.2%Gemini 2.5 Pro leads
AA Openness IndexSource —38.9%Not comparable
AA MMLU-ProSource —80.8%Not comparable
Math
BenchmarkGemini 2.5 ProGPT-OSS 120BResult
FrontierMath v2 (Tiers 1-3)Source 14.138%—Not comparable
FrontierMath v2 (Tier 4)Source 4.167%—Not comparable
AA AIME 2025Source —93.4%Not comparable
Multilingual
BenchmarkGemini 2.5 ProGPT-OSS 120BResult
AA Global-MMLU-LiteSource —82.8%Not comparable
Multimodal
BenchmarkGemini 2.5 ProGPT-OSS 120BResult
AA-MMMU-ProSource 74.9%—Not comparable
Design Arena WebsiteSource 11991000Gemini 2.5 Pro leads
Inst. Following
BenchmarkGemini 2.5 ProGPT-OSS 120BResult
AA-IFBenchSource 48.7%69.0%GPT-OSS 120B leads
Frequently Asked Questions (3)

Can I compare Gemini 2.5 Pro and GPT-OSS 120B 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 Gemini 2.5 Pro and GPT-OSS 120B today?

Gemini 2.5 Pro: $1.25 input / $10.00 output per 1M tokens GPT-OSS 120B: $0.00 input / $0.00 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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Last updated: July 20, 2026

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