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Gemini 2.5 Pro vs GPT-5.5

GPT-5.5 leads Gemini 2.5 Pro on coding, 71.3 to 19.1 on the Vibe Coding Index, and Gemini 2.5 Pro costs 3.0x less per output token ($10.00 vs $30.00 per million). Updated October 22, 2026; 81 benchmarks have a result for both.

Replace Gemini 2.5 Pro Replace GPT-5.5
Gemini 2.5 ProGoogle
Coding
19.1
Overall
41.8
Output $/M
$10.00
8
GPT-5.5OpenAI
Coding
71.3
Overall
69.2
Output $/M
$30.00
73
vs boards won of 81 shared

Gemini 2.5 Pro or GPT-5.5: which to pick

Pick GPT-5.5 for coding: it scores 71.3 on the Vibe Coding Index against 19.1 for Gemini 2.5 Pro.

Pick Gemini 2.5 Pro for output tokens 3.0x cheaper ($10.00 vs $30.00 per million) and a lower cost per solved task ($0.64 against $1.65).

Model AGemini 2.5 ProGoogle19.1/1003 independent benchmarks$0.64 per solved taskModel BGPT-5.5OpenAI71.3/1005 independent benchmarks$1.65 per solved task
Shared results
81
Gemini 2.5 Pro only
9
GPT-5.5 only
53
Like-for-like categories
8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Gemini 2.5 Pro 19.1 from 3 benchmarks, GPT-5.5 71.3 from 5 benchmarks.
Widest category
Coding, 34.5 points apart on average over 13 shared benchmarks.
Widest single gap
ARC-AGI-2: Gemini 2.5 Pro 4.9% against GPT-5.5 85.0%, 80.1 points apart on a 0 to 100 scale.
Output price
Gemini 2.5 Pro $10.00 against GPT-5.5 $30.00 per million output tokens, 3.0x apart.
Context window
Gemini 2.5 Pro takes 1.05M tokens, GPT-5.5 1.05M.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryGemini 2.5 ProBarsGPT-5.5Ties
Coding013
Intelligence02
Agentic work04
Reasoning011
Math14
Knowledge36
Web design06
General427
All shared boards873
CodingLike-for-likeSix of these boards feed the Vibe Coding Index013
Coding benchmarks for Gemini 2.5 Pro and GPT-5.5
BenchmarkGemini 2.5 ProGPT-5.5Leader
SWE-bench Verified53.6%Not measuredOnly Gemini 2.5 Pro measured
LiveBench codingNot measured85.1%Only GPT-5.5 measured
LMArena WebDev12261513GPT-5.5
AA Coding Index33.374.9GPT-5.5
LiveCodeBench (Vals AI)Not measured85.3%Only GPT-5.5 measured
SWE-bench Verified (Vals AI)54.4%82.6%GPT-5.5
Vibe Code Bench (Vals AI)0.4%69.8%GPT-5.5
Code migration (Vals AI)Not measured45.2%Only GPT-5.5 measured
ProgramBench (Vals AI)Not measured0.5%Only GPT-5.5 measured
Terminal-Bench 2.1 (Vals AI)Not measured76.4%Only GPT-5.5 measured
SkillsBench (Vals AI)Not measured62.5%Only GPT-5.5 measured
LiveCodeBench (Artificial Analysis run)80.1%Not measuredOnly Gemini 2.5 Pro measured
SciCode46.3%56.1%GPT-5.5
Terminal-Bench Hard (Artificial Analysis run)26.5%60.6%GPT-5.5
Terminal-Bench32.6%84.7%GPT-5.5
FrontierCodeNot measured43.0%Only GPT-5.5 measured
GSO-Bench3.9%40.2%GPT-5.5
WeirdML54.0%84.9%GPT-5.5
MirrorCodeNot measured10.0%Only GPT-5.5 measured
ALE-BenchNot measured1943.0Only GPT-5.5 measured
LMArena Text: coding14521494GPT-5.5
LMArena Text: software and IT14591493GPT-5.5
LMArena WebDev: ReactNot measured1506Only GPT-5.5 measured
LMArena WebDev: HTML12351543GPT-5.5
LMArena WebDev: from an image12851532GPT-5.5
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Gemini 2.5 Pro and GPT-5.5
BenchmarkGemini 2.5 ProGPT-5.5Leader
AA Intelligence Index16.138.4GPT-5.5
Epoch Capabilities Index145.1159.7GPT-5.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index04
Agentic work benchmarks for Gemini 2.5 Pro and GPT-5.5
BenchmarkGemini 2.5 ProGPT-5.5Leader
AA Agentic Index1.636.4GPT-5.5
Design Arena: agents building web appsNot measured1117Only GPT-5.5 measured
Design Arena: agents building full-stack appsNot measured1089Only GPT-5.5 measured
Design Arena: agents building mobile appsNot measured1142Only GPT-5.5 measured
Design Arena: agents building Android appsNot measured1164Only GPT-5.5 measured
Design Arena: agents building Godot gamesNot measured1173Only GPT-5.5 measured
Design Arena: agents building gamesNot measured1179Only GPT-5.5 measured
Design Arena: HTML slidesNot measured1017Only GPT-5.5 measured
Design Arena: PowerPoint slidesNot measured1084Only GPT-5.5 measured
LiveBench researchNot measured61.6%Only GPT-5.5 measured
LiveBench browserNot measured48.0%Only GPT-5.5 measured
LiveBench long agenticNot measured44.6%Only GPT-5.5 measured
SREBench (Vals AI)Not measured3.8%Only GPT-5.5 measured
Finance Agent (Vals AI)Not measured51.8%Only GPT-5.5 measured
Tax Agent Bench (Vals AI)Not measured21.8%Only GPT-5.5 measured
Legal Research Bench (Vals AI)Not measured40.4%Only GPT-5.5 measured
Excel Modeling Benchmark (Vals AI)Not measured64.5%Only GPT-5.5 measured
Time Horizon Index (Vals AI)Not measured8.3%Only GPT-5.5 measured
τ²-Bench Telecom54.1%93.9%GPT-5.5
APEX-AgentsNot measured55.1%Only GPT-5.5 measured
Remote Labor IndexNot measured6.3%Only GPT-5.5 measured
GDPval23.3%Not measuredOnly Gemini 2.5 Pro measured
OSWorld 2.0Not measured13.0%Only GPT-5.5 measured
DeepResearch Bench41.5%54.0%GPT-5.5
PostTrainBenchNot measured27.2%Only GPT-5.5 measured
Vending-Bench 2$574$7,524GPT-5.5
BrowseComp-Plus29.5%Not measuredOnly Gemini 2.5 Pro measured
Neither model has a result on the other 14 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index011
Reasoning benchmarks for Gemini 2.5 Pro and GPT-5.5
BenchmarkGemini 2.5 ProGPT-5.5Leader
GPQA DiamondNot measured93.2%Only GPT-5.5 measured
LiveBench reasoningNot measured89.7%Only GPT-5.5 measured
MMMU Pro (Vals AI)Not measured88.3%Only GPT-5.5 measured
GPQA Diamond (Artificial Analysis run)84.4%93.5%GPT-5.5
Humanity's Last Exam (Artificial Analysis run)22.5%45.8%GPT-5.5
GPQA Diamond (Epoch AI run)85.3%90.7%GPT-5.5
ARC-AGI41.0%95.0%GPT-5.5
ARC-AGI-24.9%85.0%GPT-5.5
SimpleBenchNot measured69.0%Only GPT-5.5 measured
Chess puzzlesNot measured63.0%Only GPT-5.5 measured
Mystery game puzzlesNot measured56.0%Only GPT-5.5 measured
EBR-benchNot measured34.3%Only GPT-5.5 measured
LMArena Text: hard prompts14551489GPT-5.5
LMArena Text: expert14521507GPT-5.5
LMArena Text: hard prompts in English14531483GPT-5.5
LMArena Vision: diagrams12741325GPT-5.5
LMArena Vision: homework12811332GPT-5.5
Kagi LLM Benchmark70.3%88.8%GPT-5.5
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index14
Math benchmarks for Gemini 2.5 Pro and GPT-5.5
BenchmarkGemini 2.5 ProGPT-5.5Leader
AA Math Index87.7Not measuredOnly Gemini 2.5 Pro measured
AIME 2025 (Artificial Analysis run)87.7%Not measuredOnly Gemini 2.5 Pro measured
OTIS Mock AIME84.7%84.4%Gemini 2.5 Pro
FrontierMath, tiers 1 to 324.6%85.3%GPT-5.5
FrontierMath, tier 40.0%72.5%GPT-5.5
ProofBenchNot measured50.0%Only GPT-5.5 measured
LMArena Text: math14501487GPT-5.5
LMArena Text: mathematical work14541496GPT-5.5
Neither model has a result on the other 5 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index36
Knowledge benchmarks for Gemini 2.5 Pro and GPT-5.5
BenchmarkGemini 2.5 ProGPT-5.5Leader
MMLU ProNot measured88.1%Only GPT-5.5 measured
LegalBench (Vals AI)Not measured86.5%Only GPT-5.5 measured
CaseLaw (Vals AI)63.9%66.2%GPT-5.5
CorpFin (Vals AI)60.8%68.4%GPT-5.5
TaxEval (Vals AI)Not measured75.0%Only GPT-5.5 measured
MortgageTax (Vals AI)68.9%68.8%Gemini 2.5 Pro
MedCode (Vals AI)50.6%49.1%Gemini 2.5 Pro
MMLU Pro (Artificial Analysis run)86.2%Not measuredOnly Gemini 2.5 Pro measured
SimpleQA VerifiedNot measured63.0%Only GPT-5.5 measured
LMArena Text: science14801485GPT-5.5
LMArena Text: medicine and healthcare14761465Gemini 2.5 Pro
LMArena Text: legal and government14801491GPT-5.5
LMArena Text: business and finance14391478GPT-5.5
FACTS Benchmark Suite61.5%66.7%GPT-5.5
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index06
Web design benchmarks for Gemini 2.5 Pro and GPT-5.5
BenchmarkGemini 2.5 ProGPT-5.5Leader
Design Arena: websites11671256GPT-5.5
Design Arena: UI components11371257GPT-5.5
Design Arena: game dev11111293GPT-5.5
Design Arena: data viz12221264GPT-5.5
Design Arena: 3D10801197GPT-5.5
Design Arena: all code categories11521260GPT-5.5
Design Arena: SVGNot measured1234Only GPT-5.5 measured
Design Arena: ASCII artNot measured1255Only GPT-5.5 measured
LiveBench designNot measured70.3%Only GPT-5.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index427
General benchmarks for Gemini 2.5 Pro and GPT-5.5
BenchmarkGemini 2.5 ProGPT-5.5Leader
LiveBench data analysisNot measured81.6%Only GPT-5.5 measured
Public Benefits Bench (Vals AI)Not measured60.9%Only GPT-5.5 measured
SAGE (Vals AI)41.9%51.5%GPT-5.5
MedScribe (Vals AI)73.5%86.9%GPT-5.5
Vals Multimodal IndexNot measured68.1%Only GPT-5.5 measured
IFBench48.7%75.9%GPT-5.5
Long context reasoning (AA-LCR)69.0%84.3%GPT-5.5
DTBench82.4%96.0%GPT-5.5
LMCA34.8%54.3%GPT-5.5
Creative writing (Lech Mazur)83.8%Not measuredOnly Gemini 2.5 Pro measured
Surface Evolver BenchNot measured88.1%Only GPT-5.5 measured
Furniture assemblyNot measured44.2%Only GPT-5.5 measured
ExploitBenchNot measured47.4%Only GPT-5.5 measured
CL-bench LifeNot measured22.2%Only GPT-5.5 measured
LMArena Text14581471GPT-5.5
LMArena Text: instruction following14371478GPT-5.5
LMArena Text: creative writing14541455GPT-5.5
LMArena Vision12631297GPT-5.5
LMArena Text: English14581470GPT-5.5
LMArena Text: non-English14521467GPT-5.5
LMArena Text: Chinese15071534GPT-5.5
LMArena Text: German14871480Gemini 2.5 Pro
LMArena Text: Japanese14611499GPT-5.5
LMArena Text: Korean14341460GPT-5.5
LMArena Text: French14731485GPT-5.5
LMArena Text: Spanish14741468Gemini 2.5 Pro
LMArena Text: Russian14611473GPT-5.5
LMArena Text: Polish14791465Gemini 2.5 Pro
LMArena Text: multi-turn14531476GPT-5.5
LMArena Text: longer queries14491484GPT-5.5
LMArena Text: writing and language14541466GPT-5.5
LMArena Text: entertainment and media14411449GPT-5.5
LMArena Vision: English12611292GPT-5.5
LMArena Vision: Chinese13001360GPT-5.5
LMArena Vision: reading text12701306GPT-5.5
LMArena Vision: humor12621293GPT-5.5
LMArena Vision: captioning1304Not measuredOnly Gemini 2.5 Pro measured
LMArena Vision: recognizing things12831231Gemini 2.5 Pro
LMArena Vision: creative writing12651301GPT-5.5
LMArena Document14211486GPT-5.5
Neither model has a result on the other 6 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Gemini 2.5 Pro and GPT-5.5
BenchmarkGemini 2.5 ProGPT-5.5Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Gemini 2.5 Pro$0.0063Fits in one request
GPT-5.5$0.020Fits in one request

Gemini 2.5 Pro costs less

Repository review

50K input + 3K output tokens

Gemini 2.5 Pro$0.092Fits in one request
GPT-5.5$0.340Fits in one request

Gemini 2.5 Pro costs less

Agent loop

200K input + 10K output tokens

Gemini 2.5 Pro$0.350Fits in one request
GPT-5.5$1.30Fits in one request

Gemini 2.5 Pro costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Gemini 2.5 Pro and GPT-5.5
SpecificationGoogle Gemini 2.5 ProOpenAI GPT-5.5
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJune 17, 2025April 24, 2026
Context window1.05M1.05M
Input $/Mtok$1.25$5.00
Output $/Mtok$10.00$30.00
Coding index19.171.3
Independent measurements behind it35
Cost per solved task$0.64$1.65
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 2.5 Pro better than GPT-5.5 for coding?

Pick GPT-5.5 for coding: it scores 71.3 on the Vibe Coding Index against 19.1 for Gemini 2.5 Pro. Pick Gemini 2.5 Pro for output tokens 3.0x cheaper ($10.00 vs $30.00 per million) and a lower cost per solved task ($0.64 against $1.65).

Which is cheaper, Gemini 2.5 Pro or GPT-5.5?

Gemini 2.5 Pro costs $1.25 per million input tokens and $10.00 per million output tokens; GPT-5.5 costs $5.00 and $30.00. Per solved SWE-bench Verified task, Gemini 2.5 Pro costs $0.64 and GPT-5.5 $1.65.

Which has the bigger context window, Gemini 2.5 Pro or GPT-5.5?

GPT-5.5, with 1.05M tokens against 1.05M.

How many benchmarks is the Gemini 2.5 Pro vs GPT-5.5 comparison based on?

81 benchmarks have a result for both models as of October 22, 2026. Gemini 2.5 Pro's coding index rests on 3 independent benchmarks and GPT-5.5's on 5. Where only one model has a result, the page says so instead of naming a winner.

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