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Claude Haiku 4.5 vs gpt-oss-120b

Claude Haiku 4.5 leads gpt-oss-120b on the Artificial Analysis Intelligence Index, 16.9 to 11.6, and gpt-oss-120b costs 10.0x less per output token ($0.50 vs $5.00 per million). Updated October 22, 2026; 57 benchmarks have a result for both.

Replace Claude Haiku 4.5 Replace gpt-oss-120b
Claude Haiku 4.5Anthropic
Coding
35.6
Overall
41.0
Output $/M
$5.00
46
gpt-oss-120bOpenAI
Coding
No data
Overall
50.0
Output $/M
$0.50
11
vs boards won of 57 shared

Claude Haiku 4.5 or gpt-oss-120b: which to pick

Only Claude Haiku 4.5 has a coding score, 35.6 on the Vibe Coding Index; gpt-oss-120b has none, so the two cannot be ranked on coding.

Pick gpt-oss-120b for output tokens 10.0x cheaper ($0.50 vs $5.00 per million) and a lower cost per solved task ($0.51 against $0.56).

Model AClaude Haiku 4.5Anthropic35.6/1004 independent benchmarks$0.56 per solved taskModel Bgpt-oss-120bOpenAINot benchmarked1 independent benchmark$0.51 per solved task
Shared results
57
Claude Haiku 4.5 only
38
gpt-oss-120b only
24
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
Claude Haiku 4.5 35.6 from 4 benchmarks, gpt-oss-120b not benchmarked.
Widest category
Coding, 21.2 points apart on average over 8 shared benchmarks.
Widest single gap
LiveCodeBench (Vals AI): Claude Haiku 4.5 41.2% against gpt-oss-120b 83.2%, 42.1 points apart on a 0 to 100 scale.
Output price
Claude Haiku 4.5 $5.00 against gpt-oss-120b $0.50 per million output tokens, 10.0x apart.
Context window
Claude Haiku 4.5 takes 200K tokens, gpt-oss-120b 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
CategoryClaude Haiku 4.5Barsgpt-oss-120bTies
Coding62
Intelligence20
Agentic work20
Reasoning32
Math32
Knowledge73
Web design60
General172
All shared boards4611
CodingLike-for-likeSix of these boards feed the Vibe Coding Index62
Coding benchmarks for Claude Haiku 4.5 and gpt-oss-120b
BenchmarkClaude Haiku 4.5gpt-oss-120bLeader
Aider polyglotNot measured41.8%Only gpt-oss-120b measured
SWE-bench Verified66.6%26.0%Claude Haiku 4.5
SWE-bench Multilingual64.7%Not measuredOnly Claude Haiku 4.5 measured
LiveBench coding48.1%Not measuredOnly Claude Haiku 4.5 measured
LMArena WebDev1330Not measuredOnly Claude Haiku 4.5 measured
AA Coding Index43.930.4Claude Haiku 4.5
LiveCodeBench (Vals AI)41.2%83.2%gpt-oss-120b
SWE-bench Verified (Vals AI)66.6%33.6%Claude Haiku 4.5
Vibe Code Bench (Vals AI)11.4%Not measuredOnly Claude Haiku 4.5 measured
Code migration (Vals AI)7.5%Not measuredOnly Claude Haiku 4.5 measured
ProgramBench (Vals AI)0.0%Not measuredOnly Claude Haiku 4.5 measured
Terminal-Bench 2.1 (Vals AI)43.8%Not measuredOnly Claude Haiku 4.5 measured
LiveCodeBench (Artificial Analysis run)Not measured87.8%Only gpt-oss-120b measured
SciCodeNot measured34.0%Only gpt-oss-120b measured
Terminal-Bench Hard (Artificial Analysis run)Not measured23.5%Only gpt-oss-120b measured
Terminal-Bench35.5%18.7%Claude Haiku 4.5
WeirdML45.4%48.2%gpt-oss-120b
ALE-BenchNot measured575.6Only gpt-oss-120b measured
LMArena Text: coding14541379Claude Haiku 4.5
LMArena Text: software and IT14391387Claude Haiku 4.5
LMArena WebDev: React1326Not measuredOnly Claude Haiku 4.5 measured
LMArena WebDev: HTML1318Not measuredOnly Claude Haiku 4.5 measured
SciCodeNot measured7.7%Only gpt-oss-120b measured
Neither model has a result on the other 16 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Haiku 4.5 and gpt-oss-120b
BenchmarkClaude Haiku 4.5gpt-oss-120bLeader
AA Intelligence Index16.911.6Claude Haiku 4.5
Epoch Capabilities Index142.2139.8Claude Haiku 4.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index20
Agentic work benchmarks for Claude Haiku 4.5 and gpt-oss-120b
BenchmarkClaude Haiku 4.5gpt-oss-120bLeader
AA Agentic Index8.03.7Claude Haiku 4.5
LiveBench research42.2%Not measuredOnly Claude Haiku 4.5 measured
LiveBench browser40.0%Not measuredOnly Claude Haiku 4.5 measured
LiveBench long agentic11.1%Not measuredOnly Claude Haiku 4.5 measured
Finance Agent (Vals AI)31.0%Not measuredOnly Claude Haiku 4.5 measured
Tax Agent Bench (Vals AI)5.9%Not measuredOnly Claude Haiku 4.5 measured
Legal Research Bench (Vals AI)10.6%Not measuredOnly Claude Haiku 4.5 measured
Excel Modeling Benchmark (Vals AI)22.7%Not measuredOnly Claude Haiku 4.5 measured
τ²-Bench TelecomNot measured65.8%Only gpt-oss-120b measured
APEX-AgentsNot measured4.4%Only gpt-oss-120b measured
METR time horizonsNot measured56.6%Only gpt-oss-120b measured
BALROG31.2%Not measuredOnly Claude Haiku 4.5 measured
DeepResearch Bench45.5%Not measuredOnly Claude Haiku 4.5 measured
Vending-Bench 2$459-$22Claude Haiku 4.5
Berkeley Function Calling Leaderboard (BFCL)68.7%Not measuredOnly Claude Haiku 4.5 measured
BrowseComp-PlusNot measured67.0%Only gpt-oss-120b measured
Neither model has a result on the other 25 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index32
Reasoning benchmarks for Claude Haiku 4.5 and gpt-oss-120b
BenchmarkClaude Haiku 4.5gpt-oss-120bLeader
GPQA Diamond72.2%78.5%gpt-oss-120b
LiveBench reasoning61.7%Not measuredOnly Claude Haiku 4.5 measured
MMMU Pro (Vals AI)46.1%Not measuredOnly Claude Haiku 4.5 measured
GPQA Diamond (Artificial Analysis run)Not measured78.2%Only gpt-oss-120b measured
Humanity's Last Exam (Artificial Analysis run)Not measured19.6%Only gpt-oss-120b measured
GPQA Diamond (Epoch AI run)71.2%75.8%gpt-oss-120b
ARC-AGI47.7%Not measuredOnly Claude Haiku 4.5 measured
ARC-AGI-24.0%Not measuredOnly Claude Haiku 4.5 measured
SimpleBenchNot measured22.1%Only gpt-oss-120b measured
Chess puzzles8.0%Not measuredOnly Claude Haiku 4.5 measured
Mystery game puzzlesNot measured2.0%Only gpt-oss-120b measured
LMArena Text: hard prompts14211364Claude Haiku 4.5
LMArena Text: expert14431356Claude Haiku 4.5
LMArena Text: hard prompts in English14351368Claude Haiku 4.5
Kagi LLM BenchmarkNot measured58.6%Only gpt-oss-120b measured
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index32
Math benchmarks for Claude Haiku 4.5 and gpt-oss-120b
BenchmarkClaude Haiku 4.5gpt-oss-120bLeader
AIME82.7%92.6%gpt-oss-120b
MATH 500 (Vals AI)Not measured94.8%Only gpt-oss-120b measured
MGSM (Vals AI)92.2%92.0%Claude Haiku 4.5
AA Math IndexNot measured93.4Only gpt-oss-120b measured
AIME 2025 (Artificial Analysis run)Not measured93.4%Only gpt-oss-120b measured
OTIS Mock AIME66.7%88.9%gpt-oss-120b
MATH level 596.4%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text: math13981389Claude Haiku 4.5
LMArena Text: mathematical work14301386Claude Haiku 4.5
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index73
Knowledge benchmarks for Claude Haiku 4.5 and gpt-oss-120b
BenchmarkClaude Haiku 4.5gpt-oss-120bLeader
MMLU Pro78.7%79.2%gpt-oss-120b
LegalBench (Vals AI)81.2%75.9%Claude Haiku 4.5
CaseLaw (Vals AI)56.5%48.8%Claude Haiku 4.5
CorpFin (Vals AI)60.6%58.2%Claude Haiku 4.5
TaxEval (Vals AI)67.5%71.6%gpt-oss-120b
MortgageTax (Vals AI)62.2%Not measuredOnly Claude Haiku 4.5 measured
MedQA (Vals AI)79.6%91.4%gpt-oss-120b
MedCode (Vals AI)32.7%Not measuredOnly Claude Haiku 4.5 measured
MMLU Pro (Artificial Analysis run)Not measured80.8%Only gpt-oss-120b measured
SimpleQA Verified13.2%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text: science14061382Claude Haiku 4.5
LMArena Text: medicine and healthcare13941388Claude Haiku 4.5
LMArena Text: legal and government14001355Claude Haiku 4.5
LMArena Text: business and finance14001359Claude Haiku 4.5
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index60
Web design benchmarks for Claude Haiku 4.5 and gpt-oss-120b
BenchmarkClaude Haiku 4.5gpt-oss-120bLeader
Design Arena: websites1122967Claude Haiku 4.5
Design Arena: UI components1097924Claude Haiku 4.5
Design Arena: game dev1097992Claude Haiku 4.5
Design Arena: data viz1124987Claude Haiku 4.5
Design Arena: 3D1071901Claude Haiku 4.5
Design Arena: all code categories1114962Claude Haiku 4.5
Design Arena: SVG1025Not measuredOnly Claude Haiku 4.5 measured
Design Arena: ASCII art1140Not measuredOnly Claude Haiku 4.5 measured
LiveBench design59.9%Not measuredOnly Claude Haiku 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index172
General benchmarks for Claude Haiku 4.5 and gpt-oss-120b
BenchmarkClaude Haiku 4.5gpt-oss-120bLeader
LiveBench data analysis59.3%Not measuredOnly Claude Haiku 4.5 measured
Public Benefits Bench (Vals AI)54.3%Not measuredOnly Claude Haiku 4.5 measured
SAGE (Vals AI)31.8%Not measuredOnly Claude Haiku 4.5 measured
MedScribe (Vals AI)85.2%Not measuredOnly Claude Haiku 4.5 measured
Vals Multimodal Index42.9%Not measuredOnly Claude Haiku 4.5 measured
IFBenchNot measured69.0%Only gpt-oss-120b measured
Long context reasoning (AA-LCR)Not measured52.0%Only gpt-oss-120b measured
DTBench73.6%76.3%gpt-oss-120b
LMCA30.9%22.1%Claude Haiku 4.5
Fiction.LiveBenchNot measured44.4%Only gpt-oss-120b measured
Creative writing (Lech Mazur)Not measured77.1%Only gpt-oss-120b measured
Surface Evolver BenchNot measured25.0%Only gpt-oss-120b measured
ExploitBench13.7%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text13971366Claude Haiku 4.5
LMArena Text: instruction following14141318Claude Haiku 4.5
LMArena Text: creative writing13711274Claude Haiku 4.5
LMArena Text: English14141375Claude Haiku 4.5
LMArena Text: non-English13771351Claude Haiku 4.5
LMArena Text: Chinese14181385Claude Haiku 4.5
LMArena Text: German13741353Claude Haiku 4.5
LMArena Text: Japanese13381331Claude Haiku 4.5
LMArena Text: Korean13461282Claude Haiku 4.5
LMArena Text: French14111370Claude Haiku 4.5
LMArena Text: Spanish14211389Claude Haiku 4.5
LMArena Text: Russian13811343Claude Haiku 4.5
LMArena Text: Polish13431353gpt-oss-120b
LMArena Text: multi-turn14091340Claude Haiku 4.5
LMArena Text: longer queries14271319Claude Haiku 4.5
LMArena Text: writing and language13861306Claude Haiku 4.5
LMArena Text: entertainment and media13691292Claude Haiku 4.5
LMArena Document1420Not measuredOnly Claude Haiku 4.5 measured
Neither model has a result on the other 15 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Haiku 4.5 and gpt-oss-120b
BenchmarkClaude Haiku 4.5gpt-oss-120bLeader
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

Claude Haiku 4.5$0.0035Fits in one request
gpt-oss-120b$0.0003Fits in one request

gpt-oss-120b costs less

Repository review

50K input + 3K output tokens

Claude Haiku 4.5$0.065Fits in one request
gpt-oss-120b$0.0065Fits in one request

gpt-oss-120b costs less

Agent loop

200K input + 10K output tokens

Claude Haiku 4.5$0.250Exceeds the context window
gpt-oss-120b$0.025Exceeds the context window

gpt-oss-120b 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 Claude Haiku 4.5 and gpt-oss-120b
SpecificationAnthropic Claude Haiku 4.5OpenAI gpt-oss-120b
MakerAnthropicOpenAI
WeightsNo public weights listedOpen weights
ReleasedOctober 15, 2025August 5, 2025
Context window200K131K
Input $/Mtok$1.00$0.10
Output $/Mtok$5.00$0.50
Coding index35.6Not benchmarked
Independent measurements behind it41
Cost per solved task$0.56$0.51
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Haiku 4.5 better than gpt-oss-120b for coding?

Only Claude Haiku 4.5 has a coding score, 35.6 on the Vibe Coding Index; gpt-oss-120b has none, so the two cannot be ranked on coding. Pick gpt-oss-120b for output tokens 10.0x cheaper ($0.50 vs $5.00 per million) and a lower cost per solved task ($0.51 against $0.56).

Which is cheaper, Claude Haiku 4.5 or gpt-oss-120b?

Claude Haiku 4.5 costs $1.00 per million input tokens and $5.00 per million output tokens; gpt-oss-120b costs $0.10 and $0.50. Per solved SWE-bench Verified task, Claude Haiku 4.5 costs $0.56 and gpt-oss-120b $0.51.

Which has the bigger context window, Claude Haiku 4.5 or gpt-oss-120b?

Claude Haiku 4.5, with 200K tokens against 131K.

How many benchmarks is the Claude Haiku 4.5 vs gpt-oss-120b comparison based on?

57 benchmarks have a result for both models as of October 22, 2026. Claude Haiku 4.5's coding index rests on 4 independent benchmarks and gpt-oss-120b's on 1. Where only one model has a result, the page says so instead of naming a winner.

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