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Gemini 2.5 Flash vs GPT-5.4 Mini

GPT-5.4 Mini leads Gemini 2.5 Flash on the Artificial Analysis Intelligence Index, 24.1 to 15.5, and Gemini 2.5 Flash costs 1.8x less per output token ($2.50 vs $4.50 per million). Updated October 22, 2026; 51 benchmarks have a result for both.

Replace Gemini 2.5 Flash Replace GPT-5.4 Mini
Gemini 2.5 FlashGoogle
Coding
No data
Overall
34.3
Output $/M
$2.50
19
GPT-5.4 MiniOpenAI
Coding
35.8
Overall
44.0
Output $/M
$4.50
32
vs boards won of 51 shared

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

Only GPT-5.4 Mini has a coding score, 35.8 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 output tokens 1.8x cheaper ($2.50 vs $4.50 per million) and a lower cost per solved task ($0.466 against $0.70).

Model AGemini 2.5 FlashGoogleNot benchmarkedNo coding benchmark$0.466 per solved taskModel BGPT-5.4 MiniOpenAI35.8/1005 independent benchmarks$0.70 per solved task
Shared results
51
Gemini 2.5 Flash only
22
GPT-5.4 Mini only
38
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 Mini 35.8 from 5 benchmarks.
Widest category
Agentic work, 51.8 points apart on average over 1 shared benchmark.
Widest single gap
τ²-Bench Telecom: Gemini 2.5 Flash 31.6% against GPT-5.4 Mini 83.3%, 51.8 points apart on a 0 to 100 scale.
Output price
Gemini 2.5 Flash $2.50 against GPT-5.4 Mini $4.50 per million output tokens, 1.8x apart.
Context window
Gemini 2.5 Flash takes 1.05M tokens, GPT-5.4 Mini 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 MiniTies
Coding03
Intelligence02
Agentic work01
Reasoning28
Math02
Knowledge31
General1415
All shared boards1932
CodingLike-for-likeSix of these boards feed the Vibe Coding Index03
Coding benchmarks for Gemini 2.5 Flash and GPT-5.4 Mini
BenchmarkGemini 2.5 FlashGPT-5.4 MiniLeader
SWE-bench Verified28.7%Not measuredOnly Gemini 2.5 Flash measured
LMArena WebDevNot measured1397Only GPT-5.4 Mini measured
AA Coding IndexNot measured56.1Only GPT-5.4 Mini measured
LiveCodeBench (Vals AI)Not measured81.5%Only GPT-5.4 Mini measured
SWE-bench Verified (Vals AI)Not measured73.0%Only GPT-5.4 Mini measured
Terminal-Bench 4 (Vals AI)Not measured2.5%Only GPT-5.4 Mini measured
Vibe Code Bench (Vals AI)Not measured48.0%Only GPT-5.4 Mini measured
Code migration (Vals AI)Not measured12.9%Only GPT-5.4 Mini measured
ProgramBench (Vals AI)Not measured0.0%Only GPT-5.4 Mini measured
Terminal-Bench 2.1 (Vals AI)Not measured54.7%Only GPT-5.4 Mini measured
LiveCodeBench (Artificial Analysis run)69.5%Not measuredOnly Gemini 2.5 Flash measured
SciCodeNot measured52.1%Only GPT-5.4 Mini measured
Terminal-Bench Hard (Artificial Analysis run)13.6%52.3%GPT-5.4 Mini
Terminal-Bench17.1%Not measuredOnly Gemini 2.5 Flash measured
FrontierCodeNot measured27.0%Only GPT-5.4 Mini measured
WeirdMLNot measured60.3%Only GPT-5.4 Mini measured
ALE-BenchNot measured1188.6Only GPT-5.4 Mini measured
LMArena Text: coding14231438GPT-5.4 Mini
LMArena Text: software and IT14251436GPT-5.4 Mini
LMArena WebDev: ReactNot measured1386Only GPT-5.4 Mini measured
LMArena WebDev: HTMLNot measured1419Only GPT-5.4 Mini measured
Neither model has a result on the other 18 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 Mini
BenchmarkGemini 2.5 FlashGPT-5.4 MiniLeader
AA Intelligence Index15.524.1GPT-5.4 Mini
Epoch Capabilities Index142.9148.7GPT-5.4 Mini
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 Mini
BenchmarkGemini 2.5 FlashGPT-5.4 MiniLeader
AA Agentic IndexNot measured17.9Only GPT-5.4 Mini measured
Finance Agent (Vals AI)Not measured45.4%Only GPT-5.4 Mini measured
Tax Agent Bench (Vals AI)Not measured8.8%Only GPT-5.4 Mini measured
Legal Research Bench (Vals AI)Not measured12.5%Only GPT-5.4 Mini measured
Excel Modeling Benchmark (Vals AI)Not measured45.4%Only GPT-5.4 Mini measured
τ²-Bench Telecom31.6%83.3%GPT-5.4 Mini
BALROG33.5%Not measuredOnly Gemini 2.5 Flash measured
DeepResearch BenchNot measured36.3%Only GPT-5.4 Mini 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 30 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index28
Reasoning benchmarks for Gemini 2.5 Flash and GPT-5.4 Mini
BenchmarkGemini 2.5 FlashGPT-5.4 MiniLeader
GPQA DiamondNot measured83.1%Only GPT-5.4 Mini measured
MMMU Pro (Vals AI)Not measured79.3%Only GPT-5.4 Mini measured
GPQA Diamond (Artificial Analysis run)79.0%87.5%GPT-5.4 Mini
Humanity's Last Exam (Artificial Analysis run)12.1%28.1%GPT-5.4 Mini
GPQA Diamond (Epoch AI run)Not measured86.9%Only GPT-5.4 Mini measured
ARC-AGI33.3%63.7%GPT-5.4 Mini
ARC-AGI-22.5%18.9%GPT-5.4 Mini
SimpleBench41.2%Not measuredOnly Gemini 2.5 Flash measured
Chess puzzlesNot measured23.0%Only GPT-5.4 Mini measured
Mystery game puzzlesNot measured11.0%Only GPT-5.4 Mini measured
LMArena Text: hard prompts14221424GPT-5.4 Mini
LMArena Text: expert14261435GPT-5.4 Mini
LMArena Text: hard prompts in English14201420Gemini 2.5 Flash
LMArena Vision: diagrams12451266GPT-5.4 Mini
LMArena Vision: homework12441285GPT-5.4 Mini
Kagi LLM Benchmark56.8%37.9%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 index02
Math benchmarks for Gemini 2.5 Flash and GPT-5.4 Mini
BenchmarkGemini 2.5 FlashGPT-5.4 MiniLeader
AIMENot measured95.6%Only GPT-5.4 Mini 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 measured88.9%Only GPT-5.4 Mini measured
FrontierMath, tiers 1 to 3Not measured51.2%Only GPT-5.4 Mini measured
FrontierMath, tier 4Not measured9.8%Only GPT-5.4 Mini measured
ProofBenchNot measured21.0%Only GPT-5.4 Mini measured
LMArena Text: math14111418GPT-5.4 Mini
LMArena Text: mathematical work14221429GPT-5.4 Mini
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index31
Knowledge benchmarks for Gemini 2.5 Flash and GPT-5.4 Mini
BenchmarkGemini 2.5 FlashGPT-5.4 MiniLeader
MMLU ProNot measured84.5%Only GPT-5.4 Mini measured
CaseLaw (Vals AI)Not measured51.7%Only GPT-5.4 Mini measured
CorpFin (Vals AI)Not measured60.9%Only GPT-5.4 Mini measured
TaxEval (Vals AI)Not measured71.2%Only GPT-5.4 Mini measured
MortgageTax (Vals AI)Not measured63.5%Only GPT-5.4 Mini measured
MedCode (Vals AI)40.4%Not measuredOnly Gemini 2.5 Flash measured
MMLU Pro (Artificial Analysis run)83.2%Not measuredOnly Gemini 2.5 Flash measured
SimpleQA VerifiedNot measured29.4%Only GPT-5.4 Mini measured
LMArena Text: science14331417Gemini 2.5 Flash
LMArena Text: medicine and healthcare14281395Gemini 2.5 Flash
LMArena Text: legal and government14301414Gemini 2.5 Flash
LMArena Text: business and finance14041418GPT-5.4 Mini
FACTS Benchmark Suite47.2%Not measuredOnly Gemini 2.5 Flash measured
Neither model has a result on the other 5 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 Mini
BenchmarkGemini 2.5 FlashGPT-5.4 MiniLeader
Design Arena: websites1074Not measuredOnly Gemini 2.5 Flash measured
Design Arena: UI components1002Not measuredOnly Gemini 2.5 Flash measured
Design Arena: game dev1004Not measuredOnly Gemini 2.5 Flash measured
Design Arena: data viz1060Not measuredOnly Gemini 2.5 Flash measured
Design Arena: 3D1020Not 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 index1415
General benchmarks for Gemini 2.5 Flash and GPT-5.4 Mini
BenchmarkGemini 2.5 FlashGPT-5.4 MiniLeader
SAGE (Vals AI)44.8%50.8%GPT-5.4 Mini
MedScribe (Vals AI)83.0%Not measuredOnly Gemini 2.5 Flash measured
Vals Multimodal IndexNot measured54.2%Only GPT-5.4 Mini measured
IFBench50.3%73.3%GPT-5.4 Mini
Long context reasoning (AA-LCR)65.3%77.0%GPT-5.4 Mini
DTBench76.5%80.0%GPT-5.4 Mini
LMCA27.5%40.8%GPT-5.4 Mini
LMArena Text14171412Gemini 2.5 Flash
LMArena Text: instruction following14051405GPT-5.4 Mini
LMArena Text: creative writing14001370Gemini 2.5 Flash
LMArena Vision12351245GPT-5.4 Mini
LMArena Text: English14181412Gemini 2.5 Flash
LMArena Text: non-English14091405Gemini 2.5 Flash
LMArena Text: Chinese14491446Gemini 2.5 Flash
LMArena Text: German14171408Gemini 2.5 Flash
LMArena Text: Japanese13961375Gemini 2.5 Flash
LMArena Text: Korean13851370Gemini 2.5 Flash
LMArena Text: French14321441GPT-5.4 Mini
LMArena Text: Spanish14221405Gemini 2.5 Flash
LMArena Text: Russian14151417GPT-5.4 Mini
LMArena Text: Polish14131415GPT-5.4 Mini
LMArena Text: multi-turn14081429GPT-5.4 Mini
LMArena Text: longer queries14191408Gemini 2.5 Flash
LMArena Text: writing and language14051393Gemini 2.5 Flash
LMArena Text: entertainment and media13931373Gemini 2.5 Flash
LMArena Vision: English12391244GPT-5.4 Mini
LMArena Vision: Chinese12841286GPT-5.4 Mini
LMArena Vision: reading text12371253GPT-5.4 Mini
LMArena Vision: humor12251235GPT-5.4 Mini
LMArena Vision: captioning1277Not measuredOnly Gemini 2.5 Flash measured
LMArena Vision: recognizing things12521218Gemini 2.5 Flash
LMArena Vision: creative writing12411222Gemini 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 Mini
BenchmarkGemini 2.5 FlashGPT-5.4 MiniLeader
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 Mini$0.0030Fits in one request

Gemini 2.5 Flash costs less

Repository review

50K input + 3K output tokens

Gemini 2.5 Flash$0.022Fits in one request
GPT-5.4 Mini$0.051Fits in one request

Gemini 2.5 Flash costs less

Agent loop

200K input + 10K output tokens

Gemini 2.5 Flash$0.085Fits in one request
GPT-5.4 Mini$0.195Fits in one request

Gemini 2.5 Flash 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 Mini
SpecificationGoogle Gemini 2.5 FlashOpenAI GPT-5.4 Mini
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJune 17, 2025March 17, 2026
Context window1.05M400K
Input $/Mtok$0.30$0.75
Output $/Mtok$2.50$4.50
Coding indexNot benchmarked35.8
Independent measurements behind it05
Cost per solved task$0.466$0.70
SourceOpenRouter listingOpenRouter listing

Questions

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

Only GPT-5.4 Mini has a coding score, 35.8 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 output tokens 1.8x cheaper ($2.50 vs $4.50 per million) and a lower cost per solved task ($0.466 against $0.70).

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

Gemini 2.5 Flash costs $0.30 per million input tokens and $2.50 per million output tokens; GPT-5.4 Mini costs $0.75 and $4.50. Per solved SWE-bench Verified task, Gemini 2.5 Flash costs $0.466 and GPT-5.4 Mini $0.70.

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

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

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

51 benchmarks have a result for both models as of October 22, 2026. Gemini 2.5 Flash's coding index rests on 0 independent benchmarks and GPT-5.4 Mini's on 5. Where only one model has a result, the page says so instead of naming a winner.

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