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o3 Mini vs Qwen3.5-Flash

Qwen3.5-Flash costs 16.9x less per output token than o3 Mini ($0.26 vs $4.40 per million). Updated October 22, 2026; 44 benchmarks have a result for both.

Replace o3 Mini Replace Qwen3.5-Flash
o3 MiniOpenAI
Coding
No data
Overall
38.0
Output $/M
$4.40
2
Qwen3.5-FlashQwen
Coding
41.1
Overall
50.1
Output $/M
$0.26
42
vs boards won of 44 shared

o3 Mini or Qwen3.5-Flash: which to pick

Only Qwen3.5-Flash has a coding score, 41.1 on the Vibe Coding Index; o3 Mini has none, so the two cannot be ranked on coding.

Pick o3 Mini for work measured by Chess puzzles or FrontierMath, tiers 1 to 3, where it leads.

Model Ao3 MiniOpenAINot benchmarkedNo coding benchmarkNo cost per solved taskModel BQwen3.5-FlashQwen41.1/1002 independent benchmarks$0.40 per solved task
Shared results
44
o3 Mini only
27
Qwen3.5-Flash only
11
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
o3 Mini not benchmarked, Qwen3.5-Flash 41.1 from 2 benchmarks.
Widest category
General, 10.9 points apart on average over 19 shared benchmarks.
Widest single gap
CorpFin (Vals AI): o3 Mini 45.3% against Qwen3.5-Flash 63.6%, 18.3 points apart on a 0 to 100 scale.
Output price
o3 Mini $4.40 against Qwen3.5-Flash $0.26 per million output tokens, 16.9x apart.
Context window
o3 Mini takes 200K tokens, Qwen3.5-Flash 1M.

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
Categoryo3 MiniBarsQwen3.5-FlashTies
Coding03
Intelligence01
Reasoning16
Math14
Knowledge09
General019
All shared boards242
CodingLike-for-likeSix of these boards feed the Vibe Coding Index03
Coding benchmarks for o3 Mini and Qwen3.5-Flash
Benchmarko3 MiniQwen3.5-FlashLeader
Aider polyglot60.4%Not measuredOnly o3 Mini measured
SWE-bench Verified42.4%Not measuredOnly o3 Mini measured
SWE-bench Lite32.3%Not measuredOnly o3 Mini measured
LMArena WebDevNot measured1244Only Qwen3.5-Flash measured
LiveCodeBench (Vals AI)71.5%83.3%Qwen3.5-Flash
SWE-bench Verified (Vals AI)Not measured64.4%Only Qwen3.5-Flash measured
LiveCodeBench (Artificial Analysis run)73.4%Not measuredOnly o3 Mini measured
SciCode42.8%Not measuredOnly o3 Mini measured
Terminal-Bench Hard (Artificial Analysis run)6.8%Not measuredOnly o3 Mini measured
GSO-Bench1.3%Not measuredOnly o3 Mini measured
WeirdML43.7%Not measuredOnly o3 Mini measured
Cybench22.5%Not measuredOnly o3 Mini measured
ALE-BenchNot measured265.9Only Qwen3.5-Flash measured
LMArena Text: coding13781412Qwen3.5-Flash
LMArena Text: software and IT13641416Qwen3.5-Flash
LMArena WebDev: ReactNot measured1229Only Qwen3.5-Flash measured
LMArena WebDev: HTMLNot measured1291Only Qwen3.5-Flash measured
SciCode7.7%Not measuredOnly o3 Mini measured
Neither model has a result on the other 21 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for o3 Mini and Qwen3.5-Flash
Benchmarko3 MiniQwen3.5-FlashLeader
AA Intelligence Index12.5Not measuredOnly o3 Mini measured
Epoch Capabilities Index140.2143.5Qwen3.5-Flash
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
Agentic work benchmarks for o3 Mini and Qwen3.5-Flash
Benchmarko3 MiniQwen3.5-FlashLeader
τ²-Bench Telecom31.3%Not measuredOnly o3 Mini measured
Neither model has a result on the other 40 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index16
Reasoning benchmarks for o3 Mini and Qwen3.5-Flash
Benchmarko3 MiniQwen3.5-FlashLeader
GPQA Diamond75.5%82.8%Qwen3.5-Flash
MMMU Pro (Vals AI)Not measured81.9%Only Qwen3.5-Flash measured
GPQA Diamond (Artificial Analysis run)77.3%Not measuredOnly o3 Mini measured
Humanity's Last Exam (Artificial Analysis run)12.0%Not measuredOnly o3 Mini measured
GPQA Diamond (Epoch AI run)77.0%82.3%Qwen3.5-Flash
ARC-AGI34.5%Not measuredOnly o3 Mini measured
ARC-AGI-23.0%Not measuredOnly o3 Mini measured
SimpleBench22.8%Not measuredOnly o3 Mini measured
Chess puzzles15.0%14.0%o3 Mini
Mystery game puzzles7.0%20.0%Qwen3.5-Flash
LMArena Text: hard prompts13651403Qwen3.5-Flash
LMArena Text: expert13641407Qwen3.5-Flash
LMArena Text: hard prompts in English13751409Qwen3.5-Flash
Neither model has a result on the other 9 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index14
Math benchmarks for o3 Mini and Qwen3.5-Flash
Benchmarko3 MiniQwen3.5-FlashLeader
AIME86.5%92.5%Qwen3.5-Flash
MATH 500 (Vals AI)91.8%Not measuredOnly o3 Mini measured
MGSM (Vals AI)91.3%Not measuredOnly o3 Mini measured
OTIS Mock AIME76.9%84.4%Qwen3.5-Flash
FrontierMath, tiers 1 to 318.6%18.2%o3 Mini
FrontierMath, tier 40.0%Not measuredOnly o3 Mini measured
MATH level 596.5%Not measuredOnly o3 Mini measured
LMArena Text: math13961407Qwen3.5-Flash
LMArena Text: mathematical work13991413Qwen3.5-Flash
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index09
Knowledge benchmarks for o3 Mini and Qwen3.5-Flash
Benchmarko3 MiniQwen3.5-FlashLeader
MMLU Pro78.7%84.1%Qwen3.5-Flash
LegalBench (Vals AI)71.5%84.3%Qwen3.5-Flash
CaseLaw (Vals AI)Not measured56.0%Only Qwen3.5-Flash measured
CorpFin (Vals AI)45.3%63.6%Qwen3.5-Flash
TaxEval (Vals AI)69.4%72.2%Qwen3.5-Flash
MortgageTax (Vals AI)Not measured67.4%Only Qwen3.5-Flash measured
MedQA (Vals AI)94.8%Not measuredOnly o3 Mini measured
MedCode (Vals AI)Not measured33.0%Only Qwen3.5-Flash measured
MMLU Pro (Artificial Analysis run)80.2%Not measuredOnly o3 Mini measured
SimpleQA Verified15.3%20.3%Qwen3.5-Flash
LMArena Text: science13391415Qwen3.5-Flash
LMArena Text: medicine and healthcare13301407Qwen3.5-Flash
LMArena Text: legal and government13281398Qwen3.5-Flash
LMArena Text: business and finance13131394Qwen3.5-Flash
Neither model has a result on the other 4 boards here
Web designNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Web design benchmarks for o3 Mini and Qwen3.5-Flash
Benchmarko3 MiniQwen3.5-FlashLeader
Neither model has a result on 9 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index019
General benchmarks for o3 Mini and Qwen3.5-Flash
Benchmarko3 MiniQwen3.5-FlashLeader
SAGE (Vals AI)Not measured42.5%Only Qwen3.5-Flash measured
MedScribe (Vals AI)Not measured70.6%Only Qwen3.5-Flash measured
IFBench67.1%Not measuredOnly o3 Mini measured
Long context reasoning (AA-LCR)43.0%Not measuredOnly o3 Mini measured
DTBench68.8%82.9%Qwen3.5-Flash
LMCA19.0%29.1%Qwen3.5-Flash
Fiction.LiveBench50.0%Not measuredOnly o3 Mini measured
Creative writing (Lech Mazur)61.7%Not measuredOnly o3 Mini measured
LMArena Text13371397Qwen3.5-Flash
LMArena Text: instruction following13371374Qwen3.5-Flash
LMArena Text: creative writing12861343Qwen3.5-Flash
LMArena Text: English13511404Qwen3.5-Flash
LMArena Text: non-English13191385Qwen3.5-Flash
LMArena Text: Chinese13791445Qwen3.5-Flash
LMArena Text: German13031390Qwen3.5-Flash
LMArena Text: Japanese12861369Qwen3.5-Flash
LMArena Text: Korean13131344Qwen3.5-Flash
LMArena Text: French13341413Qwen3.5-Flash
LMArena Text: Spanish13211400Qwen3.5-Flash
LMArena Text: Russian13041380Qwen3.5-Flash
LMArena Text: Polish12941376Qwen3.5-Flash
LMArena Text: multi-turn13201393Qwen3.5-Flash
LMArena Text: longer queries13431392Qwen3.5-Flash
LMArena Text: writing and language13131369Qwen3.5-Flash
LMArena Text: entertainment and media12831347Qwen3.5-Flash
Neither model has a result on the other 21 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for o3 Mini and Qwen3.5-Flash
Benchmarko3 MiniQwen3.5-FlashLeader
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

o3 Mini$0.0033Fits in one request
Qwen3.5-Flash$0.0002Fits in one request

Qwen3.5-Flash costs less

Repository review

50K input + 3K output tokens

o3 Mini$0.068Fits in one request
Qwen3.5-Flash$0.0040Fits in one request

Qwen3.5-Flash costs less

Agent loop

200K input + 10K output tokens

o3 Mini$0.264Exceeds the context window
Qwen3.5-Flash$0.016Fits in one request

Qwen3.5-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 o3 Mini and Qwen3.5-Flash
SpecificationOpenAI o3 MiniQwen3.5-Flash
MakerOpenAIQwen
WeightsNo public weights listedNo public weights listed
ReleasedJanuary 31, 2025February 25, 2026
Context window200K1M
Input $/Mtok$1.10$0.065
Output $/Mtok$4.40$0.26
Coding indexNot benchmarked41.1
Independent measurements behind it02
Cost per solved taskNot computable$0.40
SourceOpenRouter listingOpenRouter listing

Questions

Is o3 Mini better than Qwen3.5-Flash for coding?

Only Qwen3.5-Flash has a coding score, 41.1 on the Vibe Coding Index; o3 Mini has none, so the two cannot be ranked on coding. Pick o3 Mini for work measured by Chess puzzles or FrontierMath, tiers 1 to 3, where it leads.

Which is cheaper, o3 Mini or Qwen3.5-Flash?

o3 Mini costs $1.10 per million input tokens and $4.40 per million output tokens; Qwen3.5-Flash costs $0.065 and $0.26. Cost per solved task is known for Qwen3.5-Flash only.

Which has the bigger context window, o3 Mini or Qwen3.5-Flash?

Qwen3.5-Flash, with 1M tokens against 200K.

How many benchmarks is the o3 Mini vs Qwen3.5-Flash comparison based on?

44 benchmarks have a result for both models as of October 22, 2026. o3 Mini's coding index rests on 0 independent benchmarks and Qwen3.5-Flash's on 2. Where only one model has a result, the page says so instead of naming a winner.

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