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Gemini 2.5 Flash vs GPT-5.4 Nano

GPT-5.4 Nano leads Gemini 2.5 Flash on the Artificial Analysis Intelligence Index, 20.7 to 15.5, and GPT-5.4 Nano costs 2.0x less per output token ($1.25 vs $2.50 per million). Updated October 21, 2026; 53 benchmarks have a result for both.

Replace Gemini 2.5 Flash Replace GPT-5.4 Nano
Gemini 2.5 FlashGoogle
Coding
No data
Overall
34.3
Output $/M
$2.50
40
GPT-5.4 NanoOpenAI
Coding
44.8
Overall
45.7
Output $/M
$1.25
13
vs boards won of 53 shared

Gemini 2.5 Flash or GPT-5.4 Nano: which to pick

Only GPT-5.4 Nano has a coding score, 44.8 on the Vibe Coding Index; Gemini 2.5 Flash has none, so the two cannot be ranked on coding.

Pick Gemini 2.5 Flash for a larger context window (1.05M against 400K tokens) and work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.

Model AGemini 2.5 FlashGoogleNot benchmarkedNo coding benchmark$0.466 per solved taskModel BGPT-5.4 NanoOpenAI44.8/1002 independent benchmarks$0.14 per solved task
Shared results
53
Gemini 2.5 Flash only
20
GPT-5.4 Nano only
32
Like-for-like categories
7 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 Flash not benchmarked, GPT-5.4 Nano 44.8 from 2 benchmarks.
Widest category
Agentic work, 44.4 points apart on average over 1 shared benchmark.
Widest single gap
τ²-Bench Telecom: Gemini 2.5 Flash 31.6% against GPT-5.4 Nano 76.0%, 44.4 points apart on a 0 to 100 scale.
Output price
Gemini 2.5 Flash $2.50 against GPT-5.4 Nano $1.25 per million output tokens, 2.0x apart.
Context window
Gemini 2.5 Flash takes 1.05M tokens, GPT-5.4 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 FlashBarsGPT-5.4 NanoTies
Coding21
Intelligence02
Agentic work01
Reasoning64
Math20
Knowledge41
General264
All shared boards4013
CodingLike-for-likeSix of these boards feed the Vibe Coding Index21
Coding benchmarks for Gemini 2.5 Flash and GPT-5.4 Nano
BenchmarkGemini 2.5 FlashGPT-5.4 NanoLeader
SWE-bench Verified28.7%Not measuredOnly Gemini 2.5 Flash measured
AA Coding IndexNot measured56.1Only GPT-5.4 Nano measured
LiveCodeBench (Vals AI)Not measured84.0%Only GPT-5.4 Nano measured
SWE-bench Verified (Vals AI)Not measured69.8%Only GPT-5.4 Nano measured
Vibe Code Bench (Vals AI)Not measured26.1%Only GPT-5.4 Nano measured
Code migration (Vals AI)Not measured14.5%Only GPT-5.4 Nano measured
Terminal-Bench 2.1 (Vals AI)Not measured41.6%Only GPT-5.4 Nano measured
LiveCodeBench (Artificial Analysis run)69.5%Not measuredOnly Gemini 2.5 Flash measured
SciCodeNot measured47.2%Only GPT-5.4 Nano measured
Terminal-Bench Hard (Artificial Analysis run)13.6%42.4%GPT-5.4 Nano
Terminal-Bench17.1%Not measuredOnly Gemini 2.5 Flash measured
WeirdMLNot measured49.2%Only GPT-5.4 Nano measured
ALE-BenchNot measured1004.5Only GPT-5.4 Nano measured
LMArena Text: coding14231404Gemini 2.5 Flash
LMArena Text: software and IT14251402Gemini 2.5 Flash
Neither model has a result on the other 24 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Gemini 2.5 Flash and GPT-5.4 Nano
BenchmarkGemini 2.5 FlashGPT-5.4 NanoLeader
AA Intelligence Index15.520.7GPT-5.4 Nano
Epoch Capabilities Index142.9146.0GPT-5.4 Nano
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for Gemini 2.5 Flash and GPT-5.4 Nano
BenchmarkGemini 2.5 FlashGPT-5.4 NanoLeader
AA Agentic IndexNot measured16.0Only GPT-5.4 Nano measured
Finance Agent (Vals AI)Not measured38.2%Only GPT-5.4 Nano measured
Tax Agent Bench (Vals AI)Not measured5.0%Only GPT-5.4 Nano measured
Legal Research Bench (Vals AI)Not measured6.3%Only GPT-5.4 Nano measured
Excel Modeling Benchmark (Vals AI)Not measured44.8%Only GPT-5.4 Nano measured
τ²-Bench Telecom31.6%76.0%GPT-5.4 Nano
BALROG33.5%Not measuredOnly Gemini 2.5 Flash measured
Vending-Bench 2$549Not measuredOnly Gemini 2.5 Flash measured
Berkeley Function Calling Leaderboard (BFCL)56.2%Not measuredOnly Gemini 2.5 Flash measured
BrowseComp-Plus39.9%Not measuredOnly Gemini 2.5 Flash measured
Neither model has a result on the other 31 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index64
Reasoning benchmarks for Gemini 2.5 Flash and GPT-5.4 Nano
BenchmarkGemini 2.5 FlashGPT-5.4 NanoLeader
GPQA DiamondNot measured77.5%Only GPT-5.4 Nano measured
MMMU Pro (Vals AI)Not measured73.6%Only GPT-5.4 Nano measured
GPQA Diamond (Artificial Analysis run)79.0%81.7%GPT-5.4 Nano
Humanity's Last Exam (Artificial Analysis run)12.1%28.3%GPT-5.4 Nano
GPQA Diamond (Epoch AI run)Not measured78.5%Only GPT-5.4 Nano measured
ARC-AGI33.3%51.5%GPT-5.4 Nano
ARC-AGI-22.5%5.7%GPT-5.4 Nano
SimpleBench41.2%Not measuredOnly Gemini 2.5 Flash measured
Chess puzzlesNot measured45.0%Only GPT-5.4 Nano measured
Mystery game puzzlesNot measured9.0%Only GPT-5.4 Nano measured
LMArena Text: hard prompts14221381Gemini 2.5 Flash
LMArena Text: expert14261396Gemini 2.5 Flash
LMArena Text: hard prompts in English14201387Gemini 2.5 Flash
LMArena Vision: diagrams12451210Gemini 2.5 Flash
LMArena Vision: homework12441225Gemini 2.5 Flash
Kagi LLM Benchmark56.8%39.7%Gemini 2.5 Flash
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for Gemini 2.5 Flash and GPT-5.4 Nano
BenchmarkGemini 2.5 FlashGPT-5.4 NanoLeader
AIMENot measured88.8%Only GPT-5.4 Nano measured
AA Math Index73.3Not measuredOnly Gemini 2.5 Flash measured
AIME 2025 (Artificial Analysis run)73.3%Not measuredOnly Gemini 2.5 Flash measured
OTIS Mock AIMENot measured87.8%Only GPT-5.4 Nano measured
FrontierMath, tiers 1 to 3Not measured44.9%Only GPT-5.4 Nano measured
FrontierMath, tier 4Not measured12.2%Only GPT-5.4 Nano measured
ProofBenchNot measured5.0%Only GPT-5.4 Nano measured
LMArena Text: math14111405Gemini 2.5 Flash
LMArena Text: mathematical work14221409Gemini 2.5 Flash
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index41
Knowledge benchmarks for Gemini 2.5 Flash and GPT-5.4 Nano
BenchmarkGemini 2.5 FlashGPT-5.4 NanoLeader
MMLU ProNot measured77.2%Only GPT-5.4 Nano measured
LegalBench (Vals AI)Not measured77.9%Only GPT-5.4 Nano measured
CaseLaw (Vals AI)Not measured51.9%Only GPT-5.4 Nano measured
CorpFin (Vals AI)Not measured61.2%Only GPT-5.4 Nano measured
TaxEval (Vals AI)Not measured67.4%Only GPT-5.4 Nano measured
MortgageTax (Vals AI)Not measured59.1%Only GPT-5.4 Nano measured
MedCode (Vals AI)40.4%41.0%GPT-5.4 Nano
MMLU Pro (Artificial Analysis run)83.2%Not measuredOnly Gemini 2.5 Flash measured
SimpleQA VerifiedNot measured11.7%Only GPT-5.4 Nano measured
LMArena Text: science14331374Gemini 2.5 Flash
LMArena Text: medicine and healthcare14281369Gemini 2.5 Flash
LMArena Text: legal and government14301368Gemini 2.5 Flash
LMArena Text: business and finance14041366Gemini 2.5 Flash
FACTS Benchmark Suite47.2%Not measuredOnly Gemini 2.5 Flash measured
Neither model has a result on the other 4 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index7 boards, none shared
Web design benchmarks for Gemini 2.5 Flash and GPT-5.4 Nano
BenchmarkGemini 2.5 FlashGPT-5.4 NanoLeader
Design Arena: websites1074Not measuredOnly Gemini 2.5 Flash measured
Design Arena: UI components1005Not measuredOnly Gemini 2.5 Flash measured
Design Arena: game dev1005Not measuredOnly Gemini 2.5 Flash measured
Design Arena: data viz1060Not measuredOnly Gemini 2.5 Flash measured
Design Arena: 3D1021Not measuredOnly Gemini 2.5 Flash measured
Design Arena: all code categories1059Not measuredOnly Gemini 2.5 Flash measured
Design Arena: SVG1020Not measuredOnly Gemini 2.5 Flash measured
Neither model has a result on the other 2 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index264
General benchmarks for Gemini 2.5 Flash and GPT-5.4 Nano
BenchmarkGemini 2.5 FlashGPT-5.4 NanoLeader
SAGE (Vals AI)44.8%38.1%Gemini 2.5 Flash
MedScribe (Vals AI)83.0%77.1%Gemini 2.5 Flash
Vals Multimodal IndexNot measured47.6%Only GPT-5.4 Nano measured
IFBench50.3%75.9%GPT-5.4 Nano
Long context reasoning (AA-LCR)65.3%76.7%GPT-5.4 Nano
DTBench76.5%80.3%GPT-5.4 Nano
LMCA27.5%36.9%GPT-5.4 Nano
LMArena Text14171372Gemini 2.5 Flash
LMArena Text: instruction following14051362Gemini 2.5 Flash
LMArena Text: creative writing14001315Gemini 2.5 Flash
LMArena Vision12351196Gemini 2.5 Flash
LMArena Text: English14181381Gemini 2.5 Flash
LMArena Text: non-English14091359Gemini 2.5 Flash
LMArena Text: Chinese14491391Gemini 2.5 Flash
LMArena Text: German14171368Gemini 2.5 Flash
LMArena Text: Japanese13961343Gemini 2.5 Flash
LMArena Text: Korean13851321Gemini 2.5 Flash
LMArena Text: French14321395Gemini 2.5 Flash
LMArena Text: Spanish14221371Gemini 2.5 Flash
LMArena Text: Russian14151363Gemini 2.5 Flash
LMArena Text: Polish14131366Gemini 2.5 Flash
LMArena Text: multi-turn14081382Gemini 2.5 Flash
LMArena Text: longer queries14191365Gemini 2.5 Flash
LMArena Text: writing and language14051338Gemini 2.5 Flash
LMArena Text: entertainment and media13931325Gemini 2.5 Flash
LMArena Vision: English12391202Gemini 2.5 Flash
LMArena Vision: Chinese12841232Gemini 2.5 Flash
LMArena Vision: reading text12371204Gemini 2.5 Flash
LMArena Vision: humor12251161Gemini 2.5 Flash
LMArena Vision: captioning1277Not measuredOnly Gemini 2.5 Flash measured
LMArena Vision: recognizing things12521141Gemini 2.5 Flash
LMArena Vision: creative writing12411159Gemini 2.5 Flash
Neither model has a result on the other 14 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Gemini 2.5 Flash and GPT-5.4 Nano
BenchmarkGemini 2.5 FlashGPT-5.4 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 Flash$0.0015Fits in one request
GPT-5.4 Nano$0.0008Fits in one request

GPT-5.4 Nano costs less

Repository review

50K input + 3K output tokens

Gemini 2.5 Flash$0.022Fits in one request
GPT-5.4 Nano$0.014Fits in one request

GPT-5.4 Nano costs less

Agent loop

200K input + 10K output tokens

Gemini 2.5 Flash$0.085Fits in one request
GPT-5.4 Nano$0.052Fits in one request

GPT-5.4 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 Flash and GPT-5.4 Nano
SpecificationGoogle Gemini 2.5 FlashOpenAI GPT-5.4 Nano
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJune 17, 2025March 17, 2026
Context window1.05M400K
Input $/Mtok$0.30$0.20
Output $/Mtok$2.50$1.25
Coding indexNot benchmarked44.8
Independent measurements behind it02
Cost per solved task$0.466$0.14
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 2.5 Flash better than GPT-5.4 Nano for coding?

Only GPT-5.4 Nano has a coding score, 44.8 on the Vibe Coding Index; Gemini 2.5 Flash has none, so the two cannot be ranked on coding. Pick Gemini 2.5 Flash for a larger context window (1.05M against 400K tokens) and work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.

Which is cheaper, Gemini 2.5 Flash or GPT-5.4 Nano?

Gemini 2.5 Flash costs $0.30 per million input tokens and $2.50 per million output tokens; GPT-5.4 Nano costs $0.20 and $1.25. Per solved SWE-bench Verified task, Gemini 2.5 Flash costs $0.466 and GPT-5.4 Nano $0.14.

Which has the bigger context window, Gemini 2.5 Flash or GPT-5.4 Nano?

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

How many benchmarks is the Gemini 2.5 Flash vs GPT-5.4 Nano comparison based on?

53 benchmarks have a result for both models as of October 21, 2026. Gemini 2.5 Flash's coding index rests on 0 independent benchmarks and GPT-5.4 Nano's on 2. Where only one model has a result, the page says so instead of naming a winner.

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