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GPT-5.5 Pro vs o3 Mini

o3 Mini costs 40.9x less per output token than GPT-5.5 Pro ($4.40 vs $180.00 per million). Updated October 21, 2026; 9 benchmarks have a result for both.

Replace GPT-5.5 Pro Replace o3 Mini
GPT-5.5 ProOpenAI
Coding
No data
Overall
No data
Output $/M
$180.00
9
o3 MiniOpenAI
Coding
No data
Overall
12.5
Output $/M
$4.40
0
vs boards won of 9 shared

GPT-5.5 Pro or o3 Mini: which to pick

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

Pick GPT-5.5 Pro for a larger context window (1.05M against 200K tokens).

Model AGPT-5.5 ProOpenAINot benchmarkedNo coding benchmarkNo cost per solved taskModel Bo3 MiniOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
9
GPT-5.5 Pro only
0
o3 Mini only
61
Like-for-like categories
4 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-5.5 Pro not benchmarked, o3 Mini not benchmarked.
Widest category
Math, 73.6 points apart on average over 2 shared benchmarks.
Widest single gap
ARC-AGI-2: GPT-5.5 Pro 84.6% against o3 Mini 3.0%, 81.6 points apart on a 0 to 100 scale.
Output price
GPT-5.5 Pro $180.00 against o3 Mini $4.40 per million output tokens, 40.9x apart.
Context window
GPT-5.5 Pro takes 1.05M tokens, o3 Mini 200K.

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-5.5 ProBarso3 MiniTies
Intelligence10
Reasoning40
Math20
General20
All shared boards90
CodingDirectional onlySix of these boards feed the Vibe Coding Index12 boards, none shared
Coding benchmarks for GPT-5.5 Pro and o3 Mini
BenchmarkGPT-5.5 Proo3 MiniLeader
Aider polyglotNot measured60.4%Only o3 Mini measured
SWE-bench VerifiedNot measured42.4%Only o3 Mini measured
SWE-bench LiteNot measured32.3%Only o3 Mini measured
LiveCodeBench (Vals AI)Not measured71.5%Only o3 Mini measured
LiveCodeBench (Artificial Analysis run)Not measured73.4%Only o3 Mini measured
SciCodeNot measured42.8%Only o3 Mini measured
Terminal-Bench Hard (Artificial Analysis run)Not measured6.8%Only o3 Mini measured
GSO-BenchNot measured1.3%Only o3 Mini measured
WeirdMLNot measured43.7%Only o3 Mini measured
CybenchNot measured22.5%Only o3 Mini measured
LMArena Text: codingNot measured1378Only o3 Mini measured
LMArena Text: software and ITNot measured1364Only o3 Mini measured
Neither model has a result on the other 26 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for GPT-5.5 Pro and o3 Mini
BenchmarkGPT-5.5 Proo3 MiniLeader
AA Intelligence IndexNot measured12.5Only o3 Mini measured
Epoch Capabilities Index162.9140.2GPT-5.5 Pro
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
Agentic work benchmarks for GPT-5.5 Pro and o3 Mini
BenchmarkGPT-5.5 Proo3 MiniLeader
τ²-Bench TelecomNot measured31.3%Only o3 Mini measured
Neither model has a result on the other 38 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index40
Reasoning benchmarks for GPT-5.5 Pro and o3 Mini
BenchmarkGPT-5.5 Proo3 MiniLeader
GPQA DiamondNot measured75.5%Only o3 Mini measured
GPQA Diamond (Artificial Analysis run)Not measured77.3%Only o3 Mini measured
Humanity's Last Exam (Artificial Analysis run)Not measured12.0%Only o3 Mini measured
GPQA Diamond (Epoch AI run)Not measured77.0%Only o3 Mini measured
ARC-AGI96.5%34.5%GPT-5.5 Pro
ARC-AGI-284.6%3.0%GPT-5.5 Pro
SimpleBench76.9%22.8%GPT-5.5 Pro
Chess puzzles62.0%15.0%GPT-5.5 Pro
Mystery game puzzlesNot measured7.0%Only o3 Mini measured
LMArena Text: hard promptsNot measured1365Only o3 Mini measured
LMArena Text: expertNot measured1364Only o3 Mini measured
LMArena Text: hard prompts in EnglishNot measured1375Only o3 Mini measured
Neither model has a result on the other 9 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for GPT-5.5 Pro and o3 Mini
BenchmarkGPT-5.5 Proo3 MiniLeader
AIMENot measured86.5%Only o3 Mini measured
MATH 500 (Vals AI)Not measured91.8%Only o3 Mini measured
MGSM (Vals AI)Not measured91.3%Only o3 Mini measured
OTIS Mock AIMENot measured76.9%Only o3 Mini measured
FrontierMath, tiers 1 to 387.7%18.6%GPT-5.5 Pro
FrontierMath, tier 478.0%0.0%GPT-5.5 Pro
MATH level 5Not measured96.5%Only o3 Mini measured
LMArena Text: mathNot measured1396Only o3 Mini measured
LMArena Text: mathematical workNot measured1399Only o3 Mini measured
Neither model has a result on the other 4 boards here
KnowledgeDirectional onlyPublic boards, shown as published, kept out of the index11 boards, none shared
Knowledge benchmarks for GPT-5.5 Pro and o3 Mini
BenchmarkGPT-5.5 Proo3 MiniLeader
MMLU ProNot measured78.7%Only o3 Mini measured
LegalBench (Vals AI)Not measured71.5%Only o3 Mini measured
CorpFin (Vals AI)Not measured45.3%Only o3 Mini measured
TaxEval (Vals AI)Not measured69.4%Only o3 Mini measured
MedQA (Vals AI)Not measured94.8%Only o3 Mini measured
MMLU Pro (Artificial Analysis run)Not measured80.2%Only o3 Mini measured
SimpleQA VerifiedNot measured15.3%Only o3 Mini measured
LMArena Text: scienceNot measured1339Only o3 Mini measured
LMArena Text: medicine and healthcareNot measured1330Only o3 Mini measured
LMArena Text: legal and governmentNot measured1328Only o3 Mini measured
LMArena Text: business and financeNot measured1313Only o3 Mini measured
Neither model has a result on the other 6 boards here
Web designNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Web design benchmarks for GPT-5.5 Pro and o3 Mini
BenchmarkGPT-5.5 Proo3 MiniLeader
Neither model has a result on 9 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index20
General benchmarks for GPT-5.5 Pro and o3 Mini
BenchmarkGPT-5.5 Proo3 MiniLeader
IFBenchNot measured67.1%Only o3 Mini measured
Long context reasoning (AA-LCR)Not measured43.0%Only o3 Mini measured
DTBench96.0%68.8%GPT-5.5 Pro
LMCA53.9%19.0%GPT-5.5 Pro
Fiction.LiveBenchNot measured50.0%Only o3 Mini measured
Creative writing (Lech Mazur)Not measured61.7%Only o3 Mini measured
LMArena TextNot measured1337Only o3 Mini measured
LMArena Text: instruction followingNot measured1337Only o3 Mini measured
LMArena Text: creative writingNot measured1286Only o3 Mini measured
LMArena Text: EnglishNot measured1351Only o3 Mini measured
LMArena Text: non-EnglishNot measured1319Only o3 Mini measured
LMArena Text: ChineseNot measured1379Only o3 Mini measured
LMArena Text: GermanNot measured1303Only o3 Mini measured
LMArena Text: JapaneseNot measured1286Only o3 Mini measured
LMArena Text: KoreanNot measured1313Only o3 Mini measured
LMArena Text: FrenchNot measured1334Only o3 Mini measured
LMArena Text: SpanishNot measured1321Only o3 Mini measured
LMArena Text: RussianNot measured1304Only o3 Mini measured
LMArena Text: PolishNot measured1294Only o3 Mini measured
LMArena Text: multi-turnNot measured1320Only o3 Mini measured
LMArena Text: longer queriesNot measured1343Only o3 Mini measured
LMArena Text: writing and languageNot measured1313Only o3 Mini measured
LMArena Text: entertainment and mediaNot measured1283Only o3 Mini measured
Neither model has a result on the other 23 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5.5 Pro and o3 Mini
BenchmarkGPT-5.5 Proo3 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

GPT-5.5 Pro$0.120Fits in one request
o3 Mini$0.0033Fits in one request

o3 Mini costs less

Repository review

50K input + 3K output tokens

GPT-5.5 Pro$2.04Fits in one request
o3 Mini$0.068Fits in one request

o3 Mini costs less

Agent loop

200K input + 10K output tokens

GPT-5.5 Pro$7.80Fits in one request
o3 Mini$0.264Exceeds the context window

o3 Mini 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-5.5 Pro and o3 Mini
SpecificationOpenAI GPT-5.5 ProOpenAI o3 Mini
MakerOpenAIOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedApril 24, 2026January 31, 2025
Context window1.05M200K
Input $/Mtok$30.00$1.10
Output $/Mtok$180.00$4.40
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.5 Pro better than o3 Mini for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GPT-5.5 Pro for a larger context window (1.05M against 200K tokens).

Which is cheaper, GPT-5.5 Pro or o3 Mini?

GPT-5.5 Pro costs $30.00 per million input tokens and $180.00 per million output tokens; o3 Mini costs $1.10 and $4.40. Cost per solved task is known for neither of them.

Which has the bigger context window, GPT-5.5 Pro or o3 Mini?

GPT-5.5 Pro, with 1.05M tokens against 200K.

How many benchmarks is the GPT-5.5 Pro vs o3 Mini comparison based on?

9 benchmarks have a result for both models as of October 21, 2026. GPT-5.5 Pro's coding index rests on 0 independent benchmarks and o3 Mini's on 0. Where only one model has a result, the page says so instead of naming a winner.

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