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Model comparison

Gemini 2.5 Flash vs GPT-OSS 120B

Data verified

Head-to-head evidence from 12 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

48.09/100
Margin
2.0pts
winning →
50.08/100
0 category wins0 category wins

Public leaderboard positions: Gemini 2.5 Flash #130 (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 Flash and GPT-OSS 120B share 12 comparable benchmark results. 0 of 8 categories are comparable. 3 results are unique to Gemini 2.5 Flash; 15 to GPT-OSS 120B.

Updated July 20, 2026
Shared results
12
Gemini 2.5 Flash only
3
GPT-OSS 120B only
15
Comparable categories
0 / 8

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

Confidence note. This is a partial-evidence comparison with 12 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 Flash is priced at $0.30 input / $2.50 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for GPT-OSS 120B. Gemini 2.5 Flash 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 Flash and GPT-OSS 120B
CategoryGemini 2.5 FlashΔGPT-OSS 120B
MathGemini 2.5 Flash4.7MarginNo overlapGPT-OSS 120BNot measured

Operational comparison

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

MetricGemini 2.5 FlashGPT-OSS 120BComparison
Input / output priceUSD per 1M tokensGemini 2.5 Flash$0.3 input / $2.5 outputGPT-OSS 120B$0 input / $0 outputGPT-OSS 120B has the lower combined listed price.
Generation speedtokens per secondGemini 2.5 Flash221 tok/sGPT-OSS 120B262 tok/sGPT-OSS 120B has the higher measured throughput.
First-answer latencyseconds to first tokenGemini 2.5 Flash0.50 sGPT-OSS 120B0.79 sGemini 2.5 Flash reaches the first token sooner.
Context windowmaximum listed tokensGemini 2.5 Flash1MGPT-OSS 120B128KGemini 2.5 Flash lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkGemini 2.5 FlashGPT-OSS 120BResult
τ²-bench resultsSource 14.9%65.8%GPT-OSS 120B leads
AA Agentic IndexSource —13.2%Not comparable
APEX-Agents-AASource —3.1%Not comparable
GDPval-AASource —15.0%Not comparable
GDPval-AASource —799Not comparable
Gert LabsSource —29.61%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 FlashGPT-OSS 120BResult
AA-SciCodeSource 29.1%38.9%GPT-OSS 120B leads
React Native EvalsSource —71.6%Not comparable
AA Coding IndexSource —30.4%Not comparable
AA LiveCodeBenchSource —87.8%Not comparable
Reasoning
BenchmarkGemini 2.5 FlashGPT-OSS 120BResult
AA-LCRSource 45.9%50.7%GPT-OSS 120B leads
CritPtSource 1.4%1.1%Gemini 2.5 Flash leads
Knowledge
BenchmarkGemini 2.5 FlashGPT-OSS 120BResult
Artificial Analysis Intelligence IndexSource 14.1%23.8%GPT-OSS 120B leads
AA-GPQA DiamondSource 68.3%78.2%GPT-OSS 120B leads
AA-HLESource 5.1%18.5%GPT-OSS 120B leads
AA-Omniscience IndexSource -42.0%-50.0%Gemini 2.5 Flash leads
AA-Omniscience AccuracySource 26.5%21.5%Gemini 2.5 Flash leads
AA-Omniscience Hallucination RateSource 93.3%91.2%GPT-OSS 120B leads
AA Openness IndexSource —38.9%Not comparable
AA MMLU-ProSource —80.8%Not comparable
Math
BenchmarkGemini 2.5 FlashGPT-OSS 120BResult
FrontierMath v2 (Tiers 1-3)Source 4.844%—Not comparable
FrontierMath v2 (Tier 4)Source 4.167%—Not comparable
AA AIME 2025Source —93.4%Not comparable
Multilingual
BenchmarkGemini 2.5 FlashGPT-OSS 120BResult
AA Global-MMLU-LiteSource —82.8%Not comparable
Multimodal
BenchmarkGemini 2.5 FlashGPT-OSS 120BResult
AA-MMMU-ProSource 65.5%—Not comparable
Design Arena WebsiteSource 11481000Gemini 2.5 Flash leads
Inst. Following
BenchmarkGemini 2.5 FlashGPT-OSS 120BResult
AA-IFBenchSource 39.0%69.0%GPT-OSS 120B leads
Frequently Asked Questions (3)

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

Gemini 2.5 Flash: $0.30 input / $2.50 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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