Enter opens the highlighted result. Esc closes.

GPT-5 Mini vs gpt-oss-20b

GPT-5 Mini leads gpt-oss-20b on the Artificial Analysis Intelligence Index, 20.6 to 10.0, and gpt-oss-20b costs 13.3x less per output token ($0.15 vs $2.00 per million). Updated October 21, 2026; 59 benchmarks have a result for both.

Replace GPT-5 Mini Replace gpt-oss-20b
GPT-5 MiniOpenAI
Coding
34.2
Overall
20.6
Output $/M
$2.00
59
gpt-oss-20bOpenAI
Coding
No data
Overall
10.0
Output $/M
$0.15
0
vs boards won of 59 shared

GPT-5 Mini or gpt-oss-20b: which to pick

Only GPT-5 Mini has a coding score, 34.2 on the Vibe Coding Index; gpt-oss-20b has none, so the two cannot be ranked on coding.

Pick gpt-oss-20b for output tokens 13.3x cheaper ($0.15 vs $2.00 per million).

Model AGPT-5 MiniOpenAI34.2/1002 independent benchmarks$0.08 per solved taskModel Bgpt-oss-20bOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
59
GPT-5 Mini only
39
gpt-oss-20b only
1
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
GPT-5 Mini 34.2 from 2 benchmarks, gpt-oss-20b not benchmarked.
Widest category
Web design, 29.4 points apart on average over 2 shared benchmarks.
Widest single gap
Long context reasoning (AA-LCR): GPT-5 Mini 72.3% against gpt-oss-20b 34.7%, 37.7 points apart on a 0 to 100 scale.
Output price
GPT-5 Mini $2.00 against gpt-oss-20b $0.15 per million output tokens, 13.3x apart.
Context window
GPT-5 Mini takes 400K tokens, gpt-oss-20b 131K.

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
CategoryGPT-5 MiniBarsgpt-oss-20bTies
Coding80
Intelligence20
Agentic work10
Reasoning70
Math80
Knowledge110
Web design20
General200
All shared boards590
CodingLike-for-likeSix of these boards feed the Vibe Coding Index80
Coding benchmarks for GPT-5 Mini and gpt-oss-20b
BenchmarkGPT-5 Minigpt-oss-20bLeader
SWE-bench Verified59.8%Not measuredOnly GPT-5 Mini measured
SWE-bench Multilingual39.7%Not measuredOnly GPT-5 Mini measured
LiveCodeBench (Vals AI)86.6%80.4%GPT-5 Mini
SWE-bench Verified (Vals AI)60.8%Not measuredOnly GPT-5 Mini measured
Vibe Code Bench (Vals AI)14.2%Not measuredOnly GPT-5 Mini measured
LiveCodeBench (Artificial Analysis run)83.8%77.7%GPT-5 Mini
SciCode39.0%38.9%GPT-5 Mini
Terminal-Bench Hard (Artificial Analysis run)33.3%10.6%GPT-5 Mini
Terminal-Bench34.8%3.4%GPT-5 Mini
WeirdML52.7%40.9%GPT-5 Mini
ALE-BenchNot measured566.0Only gpt-oss-20b measured
LMArena Text: coding14061307GPT-5 Mini
LMArena Text: software and IT13941311GPT-5 Mini
Neither model has a result on the other 25 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-5 Mini and gpt-oss-20b
BenchmarkGPT-5 Minigpt-oss-20bLeader
AA Intelligence Index20.610.0GPT-5 Mini
Epoch Capabilities Index145.3137.7GPT-5 Mini
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for GPT-5 Mini and gpt-oss-20b
BenchmarkGPT-5 Minigpt-oss-20bLeader
τ²-Bench Telecom71.1%60.2%GPT-5 Mini
Vending-Bench 2-$31Not measuredOnly GPT-5 Mini measured
Neither model has a result on the other 37 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index70
Reasoning benchmarks for GPT-5 Mini and gpt-oss-20b
BenchmarkGPT-5 Minigpt-oss-20bLeader
GPQA Diamond80.3%68.9%GPT-5 Mini
MMMU Pro (Vals AI)78.9%Not measuredOnly GPT-5 Mini measured
GPQA Diamond (Artificial Analysis run)82.8%68.8%GPT-5 Mini
Humanity's Last Exam (Artificial Analysis run)21.5%11.0%GPT-5 Mini
GPQA Diamond (Epoch AI run)75.0%60.8%GPT-5 Mini
ARC-AGI54.3%Not measuredOnly GPT-5 Mini measured
ARC-AGI-24.4%Not measuredOnly GPT-5 Mini measured
Chess puzzles24.0%Not measuredOnly GPT-5 Mini measured
Mystery game puzzles10.0%Not measuredOnly GPT-5 Mini measured
VPCT40.2%Not measuredOnly GPT-5 Mini measured
LMArena Text: hard prompts13801274GPT-5 Mini
LMArena Text: expert13791258GPT-5 Mini
LMArena Text: hard prompts in English13831292GPT-5 Mini
LMArena Vision: diagrams1202Not measuredOnly GPT-5 Mini measured
LMArena Vision: homework1210Not measuredOnly GPT-5 Mini measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index80
Math benchmarks for GPT-5 Mini and gpt-oss-20b
BenchmarkGPT-5 Minigpt-oss-20bLeader
AIME91.5%86.0%GPT-5 Mini
MATH 500 (Vals AI)94.8%94.2%GPT-5 Mini
MGSM (Vals AI)92.6%89.0%GPT-5 Mini
AA Math Index90.789.3GPT-5 Mini
AIME 2025 (Artificial Analysis run)90.7%89.3%GPT-5 Mini
OTIS Mock AIME86.7%65.3%GPT-5 Mini
FrontierMath, tiers 1 to 346.7%Not measuredOnly GPT-5 Mini measured
FrontierMath, tier 412.2%Not measuredOnly GPT-5 Mini measured
ProofBench9.0%Not measuredOnly GPT-5 Mini measured
MATH level 597.8%Not measuredOnly GPT-5 Mini measured
LMArena Text: math13781317GPT-5 Mini
LMArena Text: mathematical work13801305GPT-5 Mini
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for GPT-5 Mini and gpt-oss-20b
BenchmarkGPT-5 Minigpt-oss-20bLeader
MMLU Pro82.2%71.6%GPT-5 Mini
LegalBench (Vals AI)81.8%70.8%GPT-5 Mini
CaseLaw (Vals AI)68.5%43.8%GPT-5 Mini
CorpFin (Vals AI)60.2%53.1%GPT-5 Mini
TaxEval (Vals AI)75.2%63.7%GPT-5 Mini
MortgageTax (Vals AI)66.9%Not measuredOnly GPT-5 Mini measured
MedQA (Vals AI)96.1%82.9%GPT-5 Mini
MedCode (Vals AI)43.0%Not measuredOnly GPT-5 Mini measured
MMLU Pro (Artificial Analysis run)83.7%74.8%GPT-5 Mini
SimpleQA Verified21.6%Not measuredOnly GPT-5 Mini measured
LMArena Text: science13711296GPT-5 Mini
LMArena Text: medicine and healthcare13801310GPT-5 Mini
LMArena Text: legal and government13751280GPT-5 Mini
LMArena Text: business and finance13581284GPT-5 Mini
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index20
Web design benchmarks for GPT-5 Mini and gpt-oss-20b
BenchmarkGPT-5 Minigpt-oss-20bLeader
Design Arena: websites1125852GPT-5 Mini
Design Arena: UI components1106Not measuredOnly GPT-5 Mini measured
Design Arena: game dev1130Not measuredOnly GPT-5 Mini measured
Design Arena: data viz1130933GPT-5 Mini
Design Arena: 3D1037Not measuredOnly GPT-5 Mini measured
Design Arena: all code categories1115Not measuredOnly GPT-5 Mini measured
Design Arena: SVG1091Not measuredOnly GPT-5 Mini measured
Design Arena: ASCII art1125Not measuredOnly GPT-5 Mini measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index200
General benchmarks for GPT-5 Mini and gpt-oss-20b
BenchmarkGPT-5 Minigpt-oss-20bLeader
SAGE (Vals AI)43.0%Not measuredOnly GPT-5 Mini measured
MedScribe (Vals AI)80.6%Not measuredOnly GPT-5 Mini measured
IFBench75.4%65.1%GPT-5 Mini
Long context reasoning (AA-LCR)72.3%34.7%GPT-5 Mini
DTBench80.5%68.0%GPT-5 Mini
LMCA34.2%14.5%GPT-5 Mini
Fiction.LiveBench69.4%Not measuredOnly GPT-5 Mini measured
Creative writing (Lech Mazur)83.1%Not measuredOnly GPT-5 Mini measured
LMArena Text13731288GPT-5 Mini
LMArena Text: instruction following13571236GPT-5 Mini
LMArena Text: creative writing13251201GPT-5 Mini
LMArena Vision1202Not measuredOnly GPT-5 Mini measured
LMArena Text: English13791303GPT-5 Mini
LMArena Text: non-English13631269GPT-5 Mini
LMArena Text: Chinese13861315GPT-5 Mini
LMArena Text: German13661255GPT-5 Mini
LMArena Text: Japanese13411244GPT-5 Mini
LMArena Text: Korean13081236GPT-5 Mini
LMArena Text: French1386Not measuredOnly GPT-5 Mini measured
LMArena Text: Spanish13541267GPT-5 Mini
LMArena Text: Russian13621278GPT-5 Mini
LMArena Text: Polish13781252GPT-5 Mini
LMArena Text: multi-turn13631268GPT-5 Mini
LMArena Text: longer queries13551250GPT-5 Mini
LMArena Text: writing and language13441238GPT-5 Mini
LMArena Text: entertainment and media13401216GPT-5 Mini
LMArena Vision: English1216Not measuredOnly GPT-5 Mini measured
LMArena Vision: Chinese1214Not measuredOnly GPT-5 Mini measured
LMArena Vision: reading text1199Not measuredOnly GPT-5 Mini measured
LMArena Vision: humor1205Not measuredOnly GPT-5 Mini measured
LMArena Vision: captioning1217Not measuredOnly GPT-5 Mini measured
LMArena Vision: recognizing things1226Not measuredOnly GPT-5 Mini measured
LMArena Vision: creative writing1181Not measuredOnly GPT-5 Mini measured
Neither model has a result on the other 13 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5 Mini and gpt-oss-20b
BenchmarkGPT-5 Minigpt-oss-20bLeader
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

GPT-5 Mini$0.0013Fits in one request
gpt-oss-20b$0.0001Fits in one request

gpt-oss-20b costs less

Repository review

50K input + 3K output tokens

GPT-5 Mini$0.018Fits in one request
gpt-oss-20b$0.0019Fits in one request

gpt-oss-20b costs less

Agent loop

200K input + 10K output tokens

GPT-5 Mini$0.070Fits in one request
gpt-oss-20b$0.0075Exceeds the context window

gpt-oss-20b 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 GPT-5 Mini and gpt-oss-20b
SpecificationOpenAI GPT-5 MiniOpenAI gpt-oss-20b
MakerOpenAIOpenAI
WeightsNo public weights listedOpen weights
ReleasedAugust 7, 2025August 5, 2025
Context window400K131K
Input $/Mtok$0.25$0.03
Output $/Mtok$2.00$0.15
Coding index34.2Not benchmarked
Independent measurements behind it20
Cost per solved task$0.08Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5 Mini better than gpt-oss-20b for coding?

Only GPT-5 Mini has a coding score, 34.2 on the Vibe Coding Index; gpt-oss-20b has none, so the two cannot be ranked on coding. Pick gpt-oss-20b for output tokens 13.3x cheaper ($0.15 vs $2.00 per million).

Which is cheaper, GPT-5 Mini or gpt-oss-20b?

GPT-5 Mini costs $0.25 per million input tokens and $2.00 per million output tokens; gpt-oss-20b costs $0.03 and $0.15. Cost per solved task is known for GPT-5 Mini only.

Which has the bigger context window, GPT-5 Mini or gpt-oss-20b?

GPT-5 Mini, with 400K tokens against 131K.

How many benchmarks is the GPT-5 Mini vs gpt-oss-20b comparison based on?

59 benchmarks have a result for both models as of October 21, 2026. GPT-5 Mini's coding index rests on 2 independent benchmarks and gpt-oss-20b's on 0. Where only one model has a result, the page says so instead of naming a winner.

Compare next