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Model comparison

Gemini 3.6 Flash vs GPT-5.5

Data verified

Head-to-head evidence from 18 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

N/A
No comparison
GPT-5.5
OpenAI
73.51/100
1 category wins0 category wins

Public leaderboard positions: Gemini 3.6 Flash unranked (Not scored); GPT-5.5 #9 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Gemini 3.6 Flash and GPT-5.5 share 18 comparable benchmark results. 1 of 8 categories are comparable. 1 result is unique to Gemini 3.6 Flash; 39 to GPT-5.5.

Updated July 21, 2026
Shared results
18
Gemini 3.6 Flash only
1
GPT-5.5 only
39
Comparable categories
1 / 8

Treat this as a split decision. Gemini 3.6 Flash makes more sense if agentic is the priority or you want the cheaper token bill; GPT-5.5 is the better fit if its strengths line up with your actual workload.

Confidence note. This is a partial-evidence comparison with 18 shared benchmark results across 5 evidence categories; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

Gemini 3.6 Flash and GPT-5.5 finish on the same BenchAlign overall score, so this is less about a single winner and more about where the edge shows up. The BenchAlign headline says tie; the benchmark table is where the real choice happens.

GPT-5.5 is also the more expensive model on tokens at $5.00 input / $30.00 output per 1M tokens, versus $1.50 input / $7.50 output per 1M tokens for Gemini 3.6 Flash. That is roughly 4.0x on output cost alone.

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 3.6 Flash and GPT-5.5
CategoryGemini 3.6 FlashΔGPT-5.5
AgenticGemini 3.6 Flash83.0Margin← 1.4GPT-5.581.6
CodingGemini 3.6 FlashNot measuredMarginNo overlapGPT-5.558.6
ReasoningGemini 3.6 FlashNot measuredMarginNo overlapGPT-5.585.0
KnowledgeGemini 3.6 FlashNot measuredMarginNo overlapGPT-5.557.8
MathGemini 3.6 FlashNot measuredMarginNo overlapGPT-5.547.6
MultimodalGemini 3.6 FlashNot measuredMarginNo overlapGPT-5.570.4

Decisive benchmark drivers

The largest measured benchmark gaps in this matchup, with exact reported values.

More
A · Gemini 3.6 FlashB · GPT-5.5

  1. OSWorld-Verified

    Agentic
    Source ↗
    A 83%B 78.7%
    Winner: Gemini 3.6 FlashΔ 4.3
    OSWorld-Verified: Gemini 3.6 Flash scored 83%; GPT-5.5 scored 78.7%. Gemini 3.6 Flash wins this benchmark.

Operational comparison

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

MetricGemini 3.6 FlashGPT-5.5Comparison
Input / output priceUSD per 1M tokensGemini 3.6 Flash$1.5 input / $7.5 outputGPT-5.5$5 input / $30 outputGemini 3.6 Flash has the lower combined listed price.
Generation speedtokens per secondGemini 3.6 FlashNot availableGPT-5.5Not availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenGemini 3.6 FlashNot availableGPT-5.5Not availableA complete latency comparison is not available.
Context windowmaximum listed tokensGemini 3.6 Flash1MGPT-5.51MListed context windows are equal.

Benchmark Deep Dive

AgenticGemini 3.6 Flash wins
BenchmarkGemini 3.6 FlashGPT-5.5Result
OSWorld-VerifiedSource 83%78.7%Gemini 3.6 Flash leads
GDPval-AASource 14211490GPT-5.5 leads
AA Agentic IndexSource 38.7%44.9%GPT-5.5 leads
GDPval-AASource 46.1%49.5%GPT-5.5 leads
AA BriefcaseSource 9611154GPT-5.5 leads
AA Tau3 BankingSource 24.5%31.3%GPT-5.5 leads
aaTerminalBench21Source 77.5%84.3%GPT-5.5 leads
Terminal-Bench 2.0Source —82%Not comparable
CyberGymSource —81.8%Not comparable
BrowseCompSource —84.4%Not comparable
MCP AtlasSource —75.3%Not comparable
ToolathlonSource —55.6%Not comparable
τ²-bench resultsSource —93.9%Not comparable
APEX-Agents-AASource —37.7%Not comparable
Gert LabsSource —72.93%Not comparable
ResearchClawBenchSource —17.0%Not comparable
OSWorld 2.0Source —13.0%Not comparable
JobBenchSource —42.7%Not comparable
ExploitGymSource —13.4%Not comparable
AA AutomationBenchSource —42.1%Not comparable
AA EnterpriseOps-GymSource —46.6%Not comparable
AA Harvey LABSource —86.3%Not comparable
AA ITBenchSource —45.8%Not comparable
terminalBenchHardSource —60.6%Not comparable
Coding
BenchmarkGemini 3.6 FlashGPT-5.5Result
deepSweSource 49%—Not comparable
AA Coding IndexSource 69.2%74.9%GPT-5.5 leads
AA-SciCodeSource 52.7%56.1%GPT-5.5 leads
SWE-bench ProSource —58.6%Not comparable
Terminal-Bench 2.0Source —82.0%Not comparable
Vibe Code BenchSource —69.85%Not comparable
React Native EvalsSource —84.7%Not comparable
cursorBench31Source —59.2%Not comparable
cursorBench32Source —58.4%Not comparable
FrontierCode 1.1 MainSource —43.0%Not comparable
Reasoning
BenchmarkGemini 3.6 FlashGPT-5.5Result
AA-LCRSource 69.7%74.3%GPT-5.5 leads
CritPtSource 10.6%27.1%GPT-5.5 leads
MRCR v2 64K-128KSource —83.1%Not comparable
MRCR v2 128K-256KSource —87.5%Not comparable
ARC-AGI-2Source —85%Not comparable
Knowledge
BenchmarkGemini 3.6 FlashGPT-5.5Result
Artificial Analysis Intelligence IndexSource 50.1%54.8%GPT-5.5 leads
AA-GPQA DiamondSource 92.8%93.5%GPT-5.5 leads
AA-HLESource 38.3%44.3%GPT-5.5 leads
AA-Omniscience IndexSource 23.5%20.1%Gemini 3.6 Flash leads
AA-Omniscience AccuracySource 50.2%56.9%GPT-5.5 leads
AA-Omniscience Hallucination RateSource 53.5%85.5%Gemini 3.6 Flash leads
GPQASource —93.6%Not comparable
GPQA-DSource —93.6%Not comparable
HLESource —52.2%Not comparable
HLE w/o toolsSource —41.4%Not comparable
Math
BenchmarkGemini 3.6 FlashGPT-5.5Result
FrontierMath (legacy)Source —51.7%Not comparable
FrontierMath v2 (Tiers 1-3)Source —51.700%Not comparable
FrontierMath v2 (Tier 4)Source —35.400%Not comparable
Multimodal
BenchmarkGemini 3.6 FlashGPT-5.5Result
AA-MMMU-ProSource 83.2%79.9%Gemini 3.6 Flash leads
MMMU-ProSource —81.2%Not comparable
MMMU-Pro w/ PythonSource —83.2%Not comparable
OfficeQA ProSource —54.1%Not comparable
Design Arena WebsiteSource —1282Not comparable
Inst. Following
BenchmarkGemini 3.6 FlashGPT-5.5Result
AA-IFBenchSource —75.9%Not comparable
Frequently Asked Questions (2)

Which is better, Gemini 3.6 Flash or GPT-5.5?

Gemini 3.6 Flash and GPT-5.5 are tied on the BenchAlign overall score, so the right pick depends on which category matters most for your use case.

Which is better for agentic tasks, Gemini 3.6 Flash or GPT-5.5?

Gemini 3.6 Flash has the edge for agentic tasks in this comparison, averaging 83 versus 81.6. Inside this category, AA Briefcase is the benchmark that creates the most daylight between them.

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Last updated: July 21, 2026

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