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Gemini 2.5 Pro vs GPT-5.1

Updated October 21, 2026. 81 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Gemini 2.5 Pro Replace GPT-5.1
Gemini 2.5 ProGoogle
Coding
37.0
Overall
16.1
Output $/M
$10.00
35
GPT-5.1OpenAI
Coding
53.3
Overall
24.7
Output $/M
$10.00
46
vs boards won of 81 shared

Decision reading

Pick GPT-5.1 for coding: it scores 53.3 on the Vibe Coding Index against 37.0 for Gemini 2.5 Pro.

Pick Gemini 2.5 Pro when a solved task costs $0.64 against $1.02, or when the context window is larger, 1.05M against 400K tokens.

Model AGemini 2.5 ProGoogle37.0/1002 independent benchmarks$0.64 per solved taskModel BGPT-5.1OpenAI53.3/1002 independent benchmarks$1.02 per solved task
Shared results
81
Gemini 2.5 Pro only
6
GPT-5.1 only
19
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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 37.0 from 2 benchmarks, GPT-5.1 53.3 from 2 benchmarks.
Widest category
Coding, 14.4 points apart on average over 14 shared benchmarks.
Widest single gap
ARC-AGI: Gemini 2.5 Pro 41.0% against GPT-5.1 72.8%, 31.8 points apart on a 0 to 100 scale.
Output price
Both cost $10.00 per million output tokens.
Context window
Gemini 2.5 Pro takes 1.05M tokens, GPT-5.1 400K.

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-5.1Ties
Coding113
Intelligence02
Agentic work03
Reasoning28
Math23
Knowledge54
Web design24
General239
All shared boards3546
CodingLike-for-likeFour of these boards feed the Vibe Coding Index113
Coding benchmarks for Gemini 2.5 Pro and GPT-5.1
BenchmarkGemini 2.5 ProGPT-5.1Leader
SWE-bench Verified53.6%66.0%GPT-5.1
LMArena WebDev12261396GPT-5.1
AA Coding Index33.349.4GPT-5.1
LiveCodeBench (Vals AI)Not measured86.5%Only GPT-5.1 measured
SWE-bench Verified (Vals AI)54.4%69.8%GPT-5.1
Vibe Code Bench (Vals AI)0.4%24.6%GPT-5.1
LiveCodeBench (Artificial Analysis run)80.1%86.8%GPT-5.1
SciCode46.3%Not measuredOnly Gemini 2.5 Pro measured
Terminal-Bench Hard (Artificial Analysis run)26.5%45.5%GPT-5.1
Terminal-Bench32.6%47.6%GPT-5.1
GSO-Bench3.9%13.7%GPT-5.1
WeirdML54.0%60.8%GPT-5.1
LMArena Text: coding14521453GPT-5.1
LMArena Text: software and IT14591454Gemini 2.5 Pro
LMArena WebDev: ReactNot measured1307Only GPT-5.1 measured
LMArena WebDev: HTML12351405GPT-5.1
LMArena WebDev: from an image12851421GPT-5.1
Neither model has a result on the other 21 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Gemini 2.5 Pro and GPT-5.1
BenchmarkGemini 2.5 ProGPT-5.1Leader
AA Intelligence Index16.124.7GPT-5.1
Epoch Capabilities Index145.1149.8GPT-5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index03
Agentic work benchmarks for Gemini 2.5 Pro and GPT-5.1
BenchmarkGemini 2.5 ProGPT-5.1Leader
AA Agentic Index1.6Not measuredOnly Gemini 2.5 Pro measured
τ²-Bench Telecom54.1%81.9%GPT-5.1
GDPval23.3%Not measuredOnly Gemini 2.5 Pro measured
DeepResearch Bench41.5%42.8%GPT-5.1
Vending-Bench 2$574$1,473GPT-5.1
Neither model has a result on the other 34 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index28
Reasoning benchmarks for Gemini 2.5 Pro and GPT-5.1
BenchmarkGemini 2.5 ProGPT-5.1Leader
GPQA DiamondNot measured86.6%Only GPT-5.1 measured
MMMU Pro (Vals AI)Not measured83.2%Only GPT-5.1 measured
GPQA Diamond (Artificial Analysis run)84.4%87.3%GPT-5.1
Humanity's Last Exam (Artificial Analysis run)22.5%28.5%GPT-5.1
GPQA Diamond (Epoch AI run)85.3%87.6%GPT-5.1
ARC-AGI41.0%72.8%GPT-5.1
ARC-AGI-24.9%17.6%GPT-5.1
SimpleBenchNot measured53.2%Only GPT-5.1 measured
Chess puzzlesNot measured42.0%Only GPT-5.1 measured
Mystery game puzzlesNot measured19.0%Only GPT-5.1 measured
VPCTNot measured58.7%Only GPT-5.1 measured
LMArena Text: hard prompts14551457GPT-5.1
LMArena Text: expert14521470GPT-5.1
LMArena Text: hard prompts in English14531462GPT-5.1
LMArena Vision: diagrams12741264Gemini 2.5 Pro
LMArena Vision: homework12811272Gemini 2.5 Pro
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index23
Math benchmarks for Gemini 2.5 Pro and GPT-5.1
BenchmarkGemini 2.5 ProGPT-5.1Leader
AIMENot measured93.3%Only GPT-5.1 measured
MGSM (Vals AI)Not measured93.0%Only GPT-5.1 measured
AA Math Index87.794.0GPT-5.1
AIME 2025 (Artificial Analysis run)87.7%94.0%GPT-5.1
OTIS Mock AIME84.7%88.6%GPT-5.1
FrontierMath, tiers 1 to 324.6%Not measuredOnly Gemini 2.5 Pro measured
FrontierMath, tier 40.0%Not measuredOnly Gemini 2.5 Pro measured
LMArena Text: math14501446Gemini 2.5 Pro
LMArena Text: mathematical work14541449Gemini 2.5 Pro
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index54
Knowledge benchmarks for Gemini 2.5 Pro and GPT-5.1
BenchmarkGemini 2.5 ProGPT-5.1Leader
MMLU ProNot measured86.4%Only GPT-5.1 measured
LegalBench (Vals AI)Not measured85.7%Only GPT-5.1 measured
CaseLaw (Vals AI)63.9%73.4%GPT-5.1
CorpFin (Vals AI)60.8%63.8%GPT-5.1
TaxEval (Vals AI)Not measured74.9%Only GPT-5.1 measured
MortgageTax (Vals AI)68.9%61.4%Gemini 2.5 Pro
MedQA (Vals AI)Not measured96.4%Only GPT-5.1 measured
MedCode (Vals AI)50.6%52.7%GPT-5.1
MMLU Pro (Artificial Analysis run)86.2%87.0%GPT-5.1
SimpleQA VerifiedNot measured48.0%Only GPT-5.1 measured
LMArena Text: science14801459Gemini 2.5 Pro
LMArena Text: medicine and healthcare14761456Gemini 2.5 Pro
LMArena Text: legal and government14801459Gemini 2.5 Pro
LMArena Text: business and finance14391431Gemini 2.5 Pro
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index24
Web design benchmarks for Gemini 2.5 Pro and GPT-5.1
BenchmarkGemini 2.5 ProGPT-5.1Leader
Design Arena: websites11671187GPT-5.1
Design Arena: UI components11391166GPT-5.1
Design Arena: game dev11121179GPT-5.1
Design Arena: data viz12221204Gemini 2.5 Pro
Design Arena: 3D10801061Gemini 2.5 Pro
Design Arena: all code categories11521171GPT-5.1
Design Arena: SVGNot measured1149Only GPT-5.1 measured
Design Arena: ASCII artNot measured1118Only GPT-5.1 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index239
General benchmarks for Gemini 2.5 Pro and GPT-5.1
BenchmarkGemini 2.5 ProGPT-5.1Leader
SAGE (Vals AI)41.9%43.2%GPT-5.1
MedScribe (Vals AI)73.5%88.1%GPT-5.1
IFBench48.7%72.9%GPT-5.1
Long context reasoning (AA-LCR)69.0%80.0%GPT-5.1
DTBench82.4%90.1%GPT-5.1
LMCA34.8%43.9%GPT-5.1
Creative writing (Lech Mazur)83.8%Not measuredOnly Gemini 2.5 Pro measured
CL-benchNot measured23.7%Only GPT-5.1 measured
CL-bench LifeNot measured17.3%Only GPT-5.1 measured
LMArena Text14581443Gemini 2.5 Pro
LMArena Text: instruction following14371443GPT-5.1
LMArena Text: creative writing14541427Gemini 2.5 Pro
LMArena Vision12631250Gemini 2.5 Pro
LMArena Text: English14581451Gemini 2.5 Pro
LMArena Text: non-English14521431Gemini 2.5 Pro
LMArena Text: Chinese15071495Gemini 2.5 Pro
LMArena Text: German14871438Gemini 2.5 Pro
LMArena Text: Japanese14611453Gemini 2.5 Pro
LMArena Text: Korean14341401Gemini 2.5 Pro
LMArena Text: French14731450Gemini 2.5 Pro
LMArena Text: Spanish14741433Gemini 2.5 Pro
LMArena Text: Russian14611435Gemini 2.5 Pro
LMArena Text: Polish14791440Gemini 2.5 Pro
LMArena Text: multi-turn14531450Gemini 2.5 Pro
LMArena Text: longer queries14491448Gemini 2.5 Pro
LMArena Text: writing and language14541428Gemini 2.5 Pro
LMArena Text: entertainment and media14411415Gemini 2.5 Pro
LMArena Vision: English12611252Gemini 2.5 Pro
LMArena Vision: Chinese13001270Gemini 2.5 Pro
LMArena Vision: reading text12701255Gemini 2.5 Pro
LMArena Vision: humor12621263GPT-5.1
LMArena Vision: captioning13041252Gemini 2.5 Pro
LMArena Vision: recognizing things12831232Gemini 2.5 Pro
LMArena Vision: creative writing12651266GPT-5.1
LMArena Document14211403Gemini 2.5 Pro
Neither model has a result on the other 11 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-5.1
BenchmarkGemini 2.5 ProGPT-5.1Leader
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-5.1$0.0063Fits in one request

Same cost

Repository review

50K input + 3K output tokens

Gemini 2.5 Pro$0.092Fits in one request
GPT-5.1$0.092Fits in one request

Same cost

Agent loop

200K input + 10K output tokens

Gemini 2.5 Pro$0.350Fits in one request
GPT-5.1$0.350Fits in one request

Same cost

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-5.1
SpecificationGoogle Gemini 2.5 ProOpenAI GPT-5.1
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJune 17, 2025November 13, 2025
Context window1.05M400K
Input $/Mtok$1.25$1.25
Output $/Mtok$10.00$10.00
Coding index37.053.3
Independent measurements behind it22
Cost per solved task$0.64$1.02
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 2.5 Pro better than GPT-5.1 for coding?

Pick GPT-5.1 for coding: it scores 53.3 on the Vibe Coding Index against 37.0 for Gemini 2.5 Pro. Pick Gemini 2.5 Pro when a solved task costs $0.64 against $1.02, or when the context window is larger, 1.05M against 400K tokens.

Which is cheaper, Gemini 2.5 Pro or GPT-5.1?

Gemini 2.5 Pro costs $1.25 per million input tokens and $10.00 per million output tokens; GPT-5.1 costs $1.25 and $10.00. Per solved SWE-bench Verified task, Gemini 2.5 Pro costs $0.64 and GPT-5.1 $1.02.

Which has the bigger context window, Gemini 2.5 Pro or GPT-5.1?

Gemini 2.5 Pro, with 1.05M tokens against 400K.

How many benchmarks is the Gemini 2.5 Pro vs GPT-5.1 comparison based on?

81 benchmarks have a result for both models as of October 21, 2026. Gemini 2.5 Pro's coding index rests on 2 independent benchmarks and GPT-5.1's on 2. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gemini-2-5-pro-vs-gpt-5-1">LLMBenchmark.ai, Gemini 2.5 Pro vs GPT-5.1</a></p>