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Model comparison

Gemini 2.5 Pro vs GPT-OSS 20B

Data verified

Head-to-head evidence from 16 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

57.25/100
Margin
14.5pts
← winning
42.74/100
0 category wins0 category wins

Public leaderboard positions: Gemini 2.5 Pro #70 (Supported); GPT-OSS 20B #159 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Gemini 2.5 Pro and GPT-OSS 20B share 16 comparable benchmark results. 0 of 8 categories are comparable. 8 results are unique to Gemini 2.5 Pro; 2 to GPT-OSS 20B.

Updated July 22, 2026
Shared results
16
Gemini 2.5 Pro only
8
GPT-OSS 20B only
2
Comparable categories
0 / 8

Benchmark data for Gemini 2.5 Pro and GPT-OSS 20B is coming soon on BenchLM.

Confidence note. This is a partial-evidence comparison with 16 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 20B. Gemini 2.5 Pro has the larger context window at 1M, compared with 128K for GPT-OSS 20B.

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 20B
CategoryGemini 2.5 ProΔGPT-OSS 20B
CodingGemini 2.5 Pro63.8MarginNo overlapGPT-OSS 20BNot measured
KnowledgeGemini 2.5 Pro27.4MarginNo overlapGPT-OSS 20BNot measured
MathGemini 2.5 Pro11.6MarginNo overlapGPT-OSS 20BNot measured

Operational comparison

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

MetricGemini 2.5 ProGPT-OSS 20BComparison
Input / output priceUSD per 1M tokensGemini 2.5 Pro$1.25 input / $10 outputGPT-OSS 20B$0 input / $0 outputGPT-OSS 20B has the lower combined listed price.
Generation speedtokens per secondGemini 2.5 Pro117 tok/sGPT-OSS 20B313 tok/sGPT-OSS 20B has the higher measured throughput.
First-answer latencyseconds to first tokenGemini 2.5 Pro21.19 sGPT-OSS 20B0.65 sGPT-OSS 20B reaches the first token sooner.
Context windowmaximum listed tokensGemini 2.5 Pro1MGPT-OSS 20B128KGemini 2.5 Pro lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkGemini 2.5 ProGPT-OSS 20BResult
AA Agentic IndexSource 7.1%3.1%Gemini 2.5 Pro leads
τ²-bench resultsSource 54.1%60.2%GPT-OSS 20B leads
Gert LabsSource 42.01%—Not comparable
GDPval-AASource 8.3%3.0%Gemini 2.5 Pro leads
GDPval-AASource 665559Gemini 2.5 Pro leads
APEX-Agents-AASource —0.7%Not comparable
Coding
BenchmarkGemini 2.5 ProGPT-OSS 20BResult
SWE-bench VerifiedSource 63.8%—Not comparable
Vibe Code BenchSource 0.40%—Not comparable
AA Coding IndexSource 33.3%20.7%Gemini 2.5 Pro leads
AA-SciCodeSource 42.8%34.4%Gemini 2.5 Pro leads
React Native EvalsSource —71%Not comparable
Reasoning
BenchmarkGemini 2.5 ProGPT-OSS 20BResult
AA-LCRSource 66.0%30.7%Gemini 2.5 Pro leads
CritPtSource 2.6%1.4%Gemini 2.5 Pro leads
Knowledge
BenchmarkGemini 2.5 ProGPT-OSS 20BResult
GPQASource 83%—Not comparable
HLESource 18.8%—Not comparable
Artificial Analysis Intelligence IndexSource 25.8%14.9%Gemini 2.5 Pro leads
AA-GPQA DiamondSource 84.4%68.8%Gemini 2.5 Pro leads
AA-HLESource 21.1%9.8%Gemini 2.5 Pro leads
AA-Omniscience IndexSource -14.3%-63.9%Gemini 2.5 Pro leads
AA-Omniscience AccuracySource 39.0%15.5%Gemini 2.5 Pro leads
AA-Omniscience Hallucination RateSource 87.4%94.1%Gemini 2.5 Pro leads
Math
BenchmarkGemini 2.5 ProGPT-OSS 20BResult
FrontierMath v2 (Tiers 1-3)Source 14.138%—Not comparable
FrontierMath v2 (Tier 4)Source 4.167%—Not comparable
Multimodal
BenchmarkGemini 2.5 ProGPT-OSS 20BResult
AA-MMMU-ProSource 74.9%—Not comparable
Design Arena WebsiteSource 1197882Gemini 2.5 Pro leads
Inst. Following
BenchmarkGemini 2.5 ProGPT-OSS 20BResult
AA-IFBenchSource 48.7%65.1%GPT-OSS 20B leads
Frequently Asked Questions (3)

Can I compare Gemini 2.5 Pro and GPT-OSS 20B 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 20B today?

Gemini 2.5 Pro: $1.25 input / $10.00 output per 1M tokens GPT-OSS 20B: $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 22, 2026

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