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Gemini 2.5 Pro vs GPT-5 Nano

Gemini 2.5 Pro leads GPT-5 Nano on the Artificial Analysis Intelligence Index, 16.1 to 13.0, and GPT-5 Nano costs 25.0x less per output token ($0.40 vs $10.00 per million). Updated October 21, 2026; 69 benchmarks have a result for both.

Replace Gemini 2.5 Pro Replace GPT-5 Nano
Gemini 2.5 ProGoogle
Coding
19.1
Overall
41.8
Output $/M
$10.00
67
GPT-5 NanoOpenAI
Coding
No data
Overall
35.6
Output $/M
$0.40
2
vs boards won of 69 shared

Gemini 2.5 Pro or GPT-5 Nano: which to pick

Only Gemini 2.5 Pro has a coding score, 19.1 on the Vibe Coding Index; GPT-5 Nano has none, so the two cannot be ranked on coding.

Pick GPT-5 Nano for output tokens 25.0x cheaper ($0.40 vs $10.00 per million) and a lower cost per solved task ($0.109 against $0.64).

Model AGemini 2.5 ProGoogle19.1/1003 independent benchmarks$0.64 per solved taskModel BGPT-5 NanoOpenAINot benchmarkedNo coding benchmark$0.109 per solved task
Shared results
69
Gemini 2.5 Pro only
21
GPT-5 Nano only
18
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 Nano not benchmarked.
Widest category
General, 23.0 points apart on average over 27 shared benchmarks.
Widest single gap
LMArena Text: Japanese: Gemini 2.5 Pro 1461 against GPT-5 Nano 1227, 39.1 points apart on a 0 to 100 scale.
Output price
Gemini 2.5 Pro $10.00 against GPT-5 Nano $0.40 per million output tokens, 25.0x apart.
Context window
Gemini 2.5 Pro takes 1.05M tokens, GPT-5 Nano 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 NanoTies
Coding70
Intelligence20
Agentic work10
Reasoning110
Math61
Knowledge80
Web design60
General261
All shared boards672
CodingLike-for-likeSix of these boards feed the Vibe Coding Index70
Coding benchmarks for Gemini 2.5 Pro and GPT-5 Nano
BenchmarkGemini 2.5 ProGPT-5 NanoLeader
SWE-bench Verified53.6%34.8%Gemini 2.5 Pro
LMArena WebDev1226Not measuredOnly Gemini 2.5 Pro measured
AA Coding Index33.3Not measuredOnly Gemini 2.5 Pro measured
LiveCodeBench (Vals AI)Not measured70.2%Only GPT-5 Nano measured
SWE-bench Verified (Vals AI)54.4%Not measuredOnly Gemini 2.5 Pro measured
Vibe Code Bench (Vals AI)0.4%Not measuredOnly Gemini 2.5 Pro measured
LiveCodeBench (Artificial Analysis run)80.1%78.9%Gemini 2.5 Pro
SciCode46.3%Not measuredOnly Gemini 2.5 Pro measured
Terminal-Bench Hard (Artificial Analysis run)26.5%17.4%Gemini 2.5 Pro
Terminal-Bench32.6%21.8%Gemini 2.5 Pro
GSO-Bench3.9%Not measuredOnly Gemini 2.5 Pro measured
WeirdML54.0%38.1%Gemini 2.5 Pro
LMArena Text: coding14521351Gemini 2.5 Pro
LMArena Text: software and IT14591345Gemini 2.5 Pro
LMArena WebDev: HTML1235Not measuredOnly Gemini 2.5 Pro measured
LMArena WebDev: from an image1285Not measuredOnly Gemini 2.5 Pro measured
Neither model has a result on the other 23 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Gemini 2.5 Pro and GPT-5 Nano
BenchmarkGemini 2.5 ProGPT-5 NanoLeader
AA Intelligence Index16.113.0Gemini 2.5 Pro
Epoch Capabilities Index145.1139.2Gemini 2.5 Pro
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for Gemini 2.5 Pro and GPT-5 Nano
BenchmarkGemini 2.5 ProGPT-5 NanoLeader
AA Agentic Index1.6Not measuredOnly Gemini 2.5 Pro measured
τ²-Bench Telecom54.1%36.5%Gemini 2.5 Pro
GDPval23.3%Not measuredOnly Gemini 2.5 Pro measured
DeepResearch Bench41.5%Not measuredOnly Gemini 2.5 Pro measured
Vending-Bench 2$574Not measuredOnly Gemini 2.5 Pro measured
Berkeley Function Calling Leaderboard (BFCL)Not measured51.4%Only GPT-5 Nano measured
BrowseComp-Plus29.5%Not measuredOnly Gemini 2.5 Pro measured
Neither model has a result on the other 34 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index110
Reasoning benchmarks for Gemini 2.5 Pro and GPT-5 Nano
BenchmarkGemini 2.5 ProGPT-5 NanoLeader
GPQA DiamondNot measured63.4%Only GPT-5 Nano measured
MMMU Pro (Vals AI)Not measured70.9%Only GPT-5 Nano measured
GPQA Diamond (Artificial Analysis run)84.4%67.6%Gemini 2.5 Pro
Humanity's Last Exam (Artificial Analysis run)22.5%9.5%Gemini 2.5 Pro
GPQA Diamond (Epoch AI run)85.3%69.4%Gemini 2.5 Pro
ARC-AGI41.0%20.7%Gemini 2.5 Pro
ARC-AGI-24.9%2.6%Gemini 2.5 Pro
Chess puzzlesNot measured22.0%Only GPT-5 Nano measured
Mystery game puzzlesNot measured9.0%Only GPT-5 Nano measured
VPCTNot measured37.2%Only GPT-5 Nano measured
LMArena Text: hard prompts14551328Gemini 2.5 Pro
LMArena Text: expert14521321Gemini 2.5 Pro
LMArena Text: hard prompts in English14531338Gemini 2.5 Pro
LMArena Vision: diagrams12741141Gemini 2.5 Pro
LMArena Vision: homework12811157Gemini 2.5 Pro
Kagi LLM Benchmark70.3%62.2%Gemini 2.5 Pro
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index61
Math benchmarks for Gemini 2.5 Pro and GPT-5 Nano
BenchmarkGemini 2.5 ProGPT-5 NanoLeader
AIMENot measured81.2%Only GPT-5 Nano measured
MATH 500 (Vals AI)Not measured93.8%Only GPT-5 Nano measured
MGSM (Vals AI)Not measured89.3%Only GPT-5 Nano measured
AA Math Index87.783.7Gemini 2.5 Pro
AIME 2025 (Artificial Analysis run)87.7%83.7%Gemini 2.5 Pro
OTIS Mock AIME84.7%81.1%Gemini 2.5 Pro
FrontierMath, tiers 1 to 324.6%20.0%Gemini 2.5 Pro
FrontierMath, tier 40.0%2.4%GPT-5 Nano
ProofBenchNot measured12.0%Only GPT-5 Nano measured
MATH level 5Not measured95.2%Only GPT-5 Nano measured
LMArena Text: math14501317Gemini 2.5 Pro
LMArena Text: mathematical work14541326Gemini 2.5 Pro
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index80
Knowledge benchmarks for Gemini 2.5 Pro and GPT-5 Nano
BenchmarkGemini 2.5 ProGPT-5 NanoLeader
MMLU ProNot measured76.1%Only GPT-5 Nano measured
LegalBench (Vals AI)Not measured50.1%Only GPT-5 Nano measured
CaseLaw (Vals AI)63.9%52.6%Gemini 2.5 Pro
CorpFin (Vals AI)60.8%Not measuredOnly Gemini 2.5 Pro measured
TaxEval (Vals AI)Not measured67.4%Only GPT-5 Nano measured
MortgageTax (Vals AI)68.9%53.6%Gemini 2.5 Pro
MedQA (Vals AI)Not measured93.3%Only GPT-5 Nano measured
MedCode (Vals AI)50.6%30.4%Gemini 2.5 Pro
MMLU Pro (Artificial Analysis run)86.2%78.0%Gemini 2.5 Pro
SimpleQA VerifiedNot measured11.7%Only GPT-5 Nano measured
LMArena Text: science14801318Gemini 2.5 Pro
LMArena Text: medicine and healthcare14761335Gemini 2.5 Pro
LMArena Text: legal and government14801298Gemini 2.5 Pro
LMArena Text: business and finance14391311Gemini 2.5 Pro
FACTS Benchmark Suite61.5%Not measuredOnly Gemini 2.5 Pro measured
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index60
Web design benchmarks for Gemini 2.5 Pro and GPT-5 Nano
BenchmarkGemini 2.5 ProGPT-5 NanoLeader
Design Arena: websites11671101Gemini 2.5 Pro
Design Arena: UI components11401067Gemini 2.5 Pro
Design Arena: game dev11111045Gemini 2.5 Pro
Design Arena: data viz12211056Gemini 2.5 Pro
Design Arena: 3D1081966Gemini 2.5 Pro
Design Arena: all code categories11521084Gemini 2.5 Pro
Neither model has a result on the other 3 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index261
General benchmarks for Gemini 2.5 Pro and GPT-5 Nano
BenchmarkGemini 2.5 ProGPT-5 NanoLeader
SAGE (Vals AI)41.9%30.4%Gemini 2.5 Pro
MedScribe (Vals AI)73.5%72.9%Gemini 2.5 Pro
IFBench48.7%67.6%GPT-5 Nano
Long context reasoning (AA-LCR)69.0%45.0%Gemini 2.5 Pro
DTBench82.4%62.7%Gemini 2.5 Pro
LMCA34.8%7.9%Gemini 2.5 Pro
Fiction.LiveBenchNot measured44.4%Only GPT-5 Nano measured
Creative writing (Lech Mazur)83.8%Not measuredOnly Gemini 2.5 Pro measured
LMArena Text14581320Gemini 2.5 Pro
LMArena Text: instruction following14371306Gemini 2.5 Pro
LMArena Text: creative writing14541249Gemini 2.5 Pro
LMArena Vision12631159Gemini 2.5 Pro
LMArena Text: English14581321Gemini 2.5 Pro
LMArena Text: non-English14521313Gemini 2.5 Pro
LMArena Text: Chinese15071356Gemini 2.5 Pro
LMArena Text: German14871327Gemini 2.5 Pro
LMArena Text: Japanese14611227Gemini 2.5 Pro
LMArena Text: Korean14341269Gemini 2.5 Pro
LMArena Text: French1473Not measuredOnly Gemini 2.5 Pro measured
LMArena Text: Spanish14741360Gemini 2.5 Pro
LMArena Text: Russian14611296Gemini 2.5 Pro
LMArena Text: Polish14791314Gemini 2.5 Pro
LMArena Text: multi-turn14531311Gemini 2.5 Pro
LMArena Text: longer queries14491312Gemini 2.5 Pro
LMArena Text: writing and language14541283Gemini 2.5 Pro
LMArena Text: entertainment and media14411268Gemini 2.5 Pro
LMArena Vision: English12611170Gemini 2.5 Pro
LMArena Vision: Chinese13001176Gemini 2.5 Pro
LMArena Vision: reading text12701152Gemini 2.5 Pro
LMArena Vision: humor12621110Gemini 2.5 Pro
LMArena Vision: captioning1304Not measuredOnly Gemini 2.5 Pro measured
LMArena Vision: recognizing things1283Not measuredOnly Gemini 2.5 Pro measured
LMArena Vision: creative writing1265Not measuredOnly Gemini 2.5 Pro measured
LMArena Document1421Not measuredOnly Gemini 2.5 Pro measured
Neither model has a result on the other 12 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 Nano
BenchmarkGemini 2.5 ProGPT-5 NanoLeader
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 Nano$0.0003Fits in one request

GPT-5 Nano costs less

Repository review

50K input + 3K output tokens

Gemini 2.5 Pro$0.092Fits in one request
GPT-5 Nano$0.0037Fits in one request

GPT-5 Nano costs less

Agent loop

200K input + 10K output tokens

Gemini 2.5 Pro$0.350Fits in one request
GPT-5 Nano$0.014Fits in one request

GPT-5 Nano 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 Nano
SpecificationGoogle Gemini 2.5 ProOpenAI GPT-5 Nano
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJune 17, 2025August 7, 2025
Context window1.05M400K
Input $/Mtok$1.25$0.05
Output $/Mtok$10.00$0.40
Coding index19.1Not benchmarked
Independent measurements behind it30
Cost per solved task$0.64$0.109
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 2.5 Pro better than GPT-5 Nano for coding?

Only Gemini 2.5 Pro has a coding score, 19.1 on the Vibe Coding Index; GPT-5 Nano has none, so the two cannot be ranked on coding. Pick GPT-5 Nano for output tokens 25.0x cheaper ($0.40 vs $10.00 per million) and a lower cost per solved task ($0.109 against $0.64).

Which is cheaper, Gemini 2.5 Pro or GPT-5 Nano?

Gemini 2.5 Pro costs $1.25 per million input tokens and $10.00 per million output tokens; GPT-5 Nano costs $0.05 and $0.40. Per solved SWE-bench Verified task, Gemini 2.5 Pro costs $0.64 and GPT-5 Nano $0.109.

Which has the bigger context window, Gemini 2.5 Pro or GPT-5 Nano?

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

How many benchmarks is the Gemini 2.5 Pro vs GPT-5 Nano comparison based on?

69 benchmarks have a result for both models as of October 21, 2026. Gemini 2.5 Pro's coding index rests on 3 independent benchmarks and GPT-5 Nano's on 0. Where only one model has a result, the page says so instead of naming a winner.

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