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GPT-4 Turbo vs gpt-oss-20b

gpt-oss-20b leads GPT-4 Turbo on the Artificial Analysis Intelligence Index, 10.0 to 7.0, and gpt-oss-20b costs 200.0x less per output token ($0.15 vs $30.00 per million). Updated October 22, 2026; 36 benchmarks have a result for both.

Replace GPT-4 Turbo Replace gpt-oss-20b
GPT-4 TurboOpenAI
Coding
No data
Overall
No data
Output $/M
$30.00
8
gpt-oss-20bOpenAI
Coding
No data
Overall
38.5
Output $/M
$0.15
28
vs boards won of 36 shared

GPT-4 Turbo or gpt-oss-20b: which to pick

Neither model has a coding score yet, so the two cannot be ranked on coding.

Pick GPT-4 Turbo for work measured by LiveCodeBench (Artificial Analysis run) or LMArena Text: coding, where it leads.

Model AGPT-4 TurboOpenAINot benchmarkedNo coding benchmarkNo cost per solved taskModel Bgpt-oss-20bOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
36
GPT-4 Turbo only
6
gpt-oss-20b only
26
Like-for-like categories
6 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-4 Turbo not benchmarked, gpt-oss-20b not benchmarked.
Widest category
Coding, 20.8 points apart on average over 3 shared benchmarks.
Widest single gap
LiveCodeBench (Artificial Analysis run): GPT-4 Turbo 29.1% against gpt-oss-20b 77.7%, 48.6 points apart on a 0 to 100 scale.
Output price
GPT-4 Turbo $30.00 against gpt-oss-20b $0.15 per million output tokens, 200.0x apart.
Context window
GPT-4 Turbo takes 128K 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-4 TurboBarsgpt-oss-20bTies
Coding03
Intelligence02
Reasoning04
Math02
Knowledge16
General711
All shared boards828
CodingLike-for-likeSix of these boards feed the Vibe Coding Index03
Coding benchmarks for GPT-4 Turbo and gpt-oss-20b
BenchmarkGPT-4 Turbogpt-oss-20bLeader
AA Coding Index21.5Not measuredOnly GPT-4 Turbo measured
LiveCodeBench (Vals AI)Not measured80.4%Only gpt-oss-20b measured
LiveCodeBench (Artificial Analysis run)29.1%77.7%gpt-oss-20b
SciCodeNot measured38.9%Only gpt-oss-20b measured
Terminal-Bench Hard (Artificial Analysis run)Not measured10.6%Only gpt-oss-20b measured
Terminal-BenchNot measured3.4%Only gpt-oss-20b measured
WeirdMLNot measured40.9%Only gpt-oss-20b measured
ALE-BenchNot measured566.0Only gpt-oss-20b measured
LMArena Text: coding12681307gpt-oss-20b
LMArena Text: software and IT12671311gpt-oss-20b
Neither model has a result on the other 29 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-4 Turbo and gpt-oss-20b
BenchmarkGPT-4 Turbogpt-oss-20bLeader
AA Intelligence Index7.010.0gpt-oss-20b
Epoch Capabilities Index127.3137.7gpt-oss-20b
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
Agentic work benchmarks for GPT-4 Turbo and gpt-oss-20b
BenchmarkGPT-4 Turbogpt-oss-20bLeader
τ²-Bench TelecomNot measured60.2%Only gpt-oss-20b measured
BrowseComp-PlusNot measured50.6%Only gpt-oss-20b measured
Neither model has a result on the other 39 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index04
Reasoning benchmarks for GPT-4 Turbo and gpt-oss-20b
BenchmarkGPT-4 Turbogpt-oss-20bLeader
GPQA DiamondNot measured68.9%Only gpt-oss-20b measured
GPQA Diamond (Artificial Analysis run)Not measured68.8%Only gpt-oss-20b measured
Humanity's Last Exam (Artificial Analysis run)3.1%11.0%gpt-oss-20b
GPQA Diamond (Epoch AI run)Not measured60.8%Only gpt-oss-20b measured
LMArena Text: hard prompts12511274gpt-oss-20b
LMArena Text: expert12231258gpt-oss-20b
LMArena Text: hard prompts in English12661292gpt-oss-20b
Kagi LLM BenchmarkNot measured53.2%Only gpt-oss-20b measured
Neither model has a result on the other 14 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index02
Math benchmarks for GPT-4 Turbo and gpt-oss-20b
BenchmarkGPT-4 Turbogpt-oss-20bLeader
AIMENot measured86.0%Only gpt-oss-20b measured
MATH 500 (Vals AI)Not measured94.2%Only gpt-oss-20b measured
MGSM (Vals AI)Not measured89.0%Only gpt-oss-20b measured
AA Math IndexNot measured89.3Only gpt-oss-20b measured
AIME 2025 (Artificial Analysis run)Not measured89.3%Only gpt-oss-20b measured
OTIS Mock AIMENot measured65.3%Only gpt-oss-20b measured
LMArena Text: math12721317gpt-oss-20b
LMArena Text: mathematical work12681305gpt-oss-20b
Neither model has a result on the other 5 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index16
Knowledge benchmarks for GPT-4 Turbo and gpt-oss-20b
BenchmarkGPT-4 Turbogpt-oss-20bLeader
MMLU ProNot measured71.6%Only gpt-oss-20b measured
LegalBench (Vals AI)80.5%70.8%GPT-4 Turbo
CaseLaw (Vals AI)Not measured43.8%Only gpt-oss-20b measured
CorpFin (Vals AI)Not measured53.1%Only gpt-oss-20b measured
TaxEval (Vals AI)Not measured63.7%Only gpt-oss-20b measured
MedQA (Vals AI)82.0%82.9%gpt-oss-20b
MMLU Pro (Artificial Analysis run)69.4%74.8%gpt-oss-20b
MMLU81.3%Not measuredOnly GPT-4 Turbo measured
LMArena Text: science12561296gpt-oss-20b
LMArena Text: medicine and healthcare12391310gpt-oss-20b
LMArena Text: legal and government12651280gpt-oss-20b
LMArena Text: business and finance12221284gpt-oss-20b
Neither model has a result on the other 6 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
Web design benchmarks for GPT-4 Turbo and gpt-oss-20b
BenchmarkGPT-4 Turbogpt-oss-20bLeader
Design Arena: websitesNot measured852Only gpt-oss-20b measured
Design Arena: data vizNot measured933Only gpt-oss-20b measured
Neither model has a result on the other 7 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index711
General benchmarks for GPT-4 Turbo and gpt-oss-20b
BenchmarkGPT-4 Turbogpt-oss-20bLeader
IFBenchNot measured65.1%Only gpt-oss-20b measured
Long context reasoning (AA-LCR)Not measured34.7%Only gpt-oss-20b measured
DTBench61.6%68.0%gpt-oss-20b
LMCA9.8%14.5%gpt-oss-20b
LMArena Text12721288gpt-oss-20b
LMArena Text: instruction following12491236GPT-4 Turbo
LMArena Text: creative writing12681201GPT-4 Turbo
LMArena Vision1090Not measuredOnly GPT-4 Turbo measured
LMArena Text: English12911303gpt-oss-20b
LMArena Text: non-English12451269gpt-oss-20b
LMArena Text: Chinese12421315gpt-oss-20b
LMArena Text: German12591255GPT-4 Turbo
LMArena Text: Japanese11941244gpt-oss-20b
LMArena Text: Korean11871236gpt-oss-20b
LMArena Text: French1276Not measuredOnly GPT-4 Turbo measured
LMArena Text: Spanish12601267gpt-oss-20b
LMArena Text: Russian12591278gpt-oss-20b
LMArena Text: Polish13021252GPT-4 Turbo
LMArena Text: multi-turn12671268gpt-oss-20b
LMArena Text: longer queries12541250GPT-4 Turbo
LMArena Text: writing and language12791238GPT-4 Turbo
LMArena Text: entertainment and media12581216GPT-4 Turbo
LMArena Vision: English1097Not measuredOnly GPT-4 Turbo measured
LMArena Vision: Chinese1045Not measuredOnly GPT-4 Turbo measured
Neither model has a result on the other 22 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-4 Turbo and gpt-oss-20b
BenchmarkGPT-4 Turbogpt-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-4 Turbo$0.025Fits in one request
gpt-oss-20b$0.0001Fits in one request

gpt-oss-20b costs less

Repository review

50K input + 3K output tokens

GPT-4 Turbo$0.590Fits in one request
gpt-oss-20b$0.0019Fits in one request

gpt-oss-20b costs less

Agent loop

200K input + 10K output tokens

GPT-4 Turbo$2.30Exceeds the context window
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-4 Turbo and gpt-oss-20b
SpecificationOpenAI GPT-4 TurboOpenAI gpt-oss-20b
MakerOpenAIOpenAI
WeightsNo public weights listedOpen weights
ReleasedApril 9, 2024August 5, 2025
Context window128K131K
Input $/Mtok$10.00$0.03
Output $/Mtok$30.00$0.15
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-4 Turbo better than gpt-oss-20b for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GPT-4 Turbo for work measured by LiveCodeBench (Artificial Analysis run) or LMArena Text: coding, where it leads.

Which is cheaper, GPT-4 Turbo or gpt-oss-20b?

GPT-4 Turbo costs $10.00 per million input tokens and $30.00 per million output tokens; gpt-oss-20b costs $0.03 and $0.15. Cost per solved task is known for neither of them.

Which has the bigger context window, GPT-4 Turbo or gpt-oss-20b?

gpt-oss-20b, with 131K tokens against 128K.

How many benchmarks is the GPT-4 Turbo vs gpt-oss-20b comparison based on?

36 benchmarks have a result for both models as of October 22, 2026. GPT-4 Turbo's coding index rests on 0 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.

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