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Models / OpenAI

GPT 5.5

GPT 5 · Released 2026-04-23

OpenAI's April 2026 flagship. Vals Index 67.62% (#2), AA Index 60.2 (#2), Terminal-Bench 2.0 82.0%, ARC-AGI-2 85% (top). LMArena Elo 1473 since April 2026. 512K context, $12.50 / $50 per 1M tokens.

Best generalist for coding agents, research workflows, and tool-heavy automation. The model the desk reaches for when we need coding agents that close the loop on a single issue.

#6 of 24 on Vals Index · current snapshot
68 Vals Index · 31 benchmark rows · 14 sourcesPosition is benchmark-specific — not a cross-family or cross-source ranking.
Composite71
Context512K
Input / 1M$13
Output / 1M$50
Knowledge cutoff2026-03-15
Statusflagship
ChatGPTCursorPerplexityScira AIFactory

Family profile

Best published score in each covered benchmark family.

87/100 avg
Knowledge
91
Reasoning
85
Math
92
Coding
96
Agentic
100
Multimodal
72
Long context
56
Tool use
87
Safety
91
Human preference
95

10 tested benchmark families

Editor's note
GPT 5.5 is the model the desk reaches for when we need coding agents that close the loop on a single issue. Terminal-Bench 2.0 (82.0%) and SWE-bench Verified (82.5%) are reproducible numbers, not vendor slideshows. The LMArena Elo lead is the most-cited number on the public market.
Benchmark placements

Where GPT 5.5 places on each public benchmark source that publishes a row. Rank counts every model with a latest row in the same test — not a universal quality score.

BenchmarkFamilyRankScoreSourceDate
LMArena (Chatbot Arena)Human preference#1/ 1395LMArena leaderboard2026-05-25
ARC-AGIReasoning#2/ 1485ARC Prize leaderboard2026-05-15
BFCLTool use#2/ 2087Berkeley Function Calling Leaderboard V42026-04-15
FrontierMathMath#2/ 1552Epoch AI FrontierMath Tiers 1-3 (v2) CSV2026-08-15
HumanEvalCoding#2/ 1596CodeSOTA HumanEval leaderboard2026-04-23
MMMUMultimodal#2/ 872MMMU leaderboard2026-04-23
GDPvalAgentic#3/ 6100Artificial Analysis — GDPval-AA v22026-06-17
HELM SafetySafety#3/ 991Stanford HELM leaderboard2026-04-23
LiveBenchReasoning#3/ 2170LiveBench leaderboard2026-04-15
LongBench v2Long context#3/ 1956LongBench v2 leaderboard2026-04-01
MCP AtlasTool use#3/ 1078MCP Atlas leaderboard2026-06-09
MMLUKnowledge#3/ 2291OpenAI model release notes2025-12-01
DeepSWECoding#4/ 867DeepSWE leaderboard v1.12026-06-20
SWE-bench VerifiedCoding#4/ 2383SWE-bench Verified leaderboard2026-06-01
AA-OmniscienceKnowledge#5/ 1257Artificial Analysis — AA-Omniscience2026-09-01
Vals IndexAgentic#6/ 2368Vals AI — Vals Index2026-06-04
Vending-Bench 2Agentic#6/ 10Andon Labs Vending-Bench 22026-08-04
CritPtReasoning#7/ 1227Artificial Analysis — CritPt2026-09-01
MATHMath#9/ 2590OpenAI model release notes2026-04-23
SciCodeCoding#10/ 18056Artificial Analysis2026-09-01
Humanity's Last ExamReasoning#12/ 18046Artificial Analysis2026-09-01
Artificial Analysis Intelligence IndexReasoning#14/ 18756Artificial Analysis2026-09-01
AIMEMath#15/ 3792OpenAI model release notes2026-04-23
Terminal-BenchAgentic#17/ 18482Terminal-Bench 2.0 leaderboard2026-05-20
τ³-Bench BankingAgentic#20/ 10639Artificial Analysis2026-09-01
IFBenchReasoning#22/ 12776Artificial Analysis2026-09-01
MMLU-ProKnowledge#28/ 3982MMLU-Pro HuggingFace leaderboard2026-04-23
AA time to first tokenPerformance#124/ 186Artificial Analysis2026-09-01
AA output speedPerformance#125/ 187Artificial Analysis2026-09-01
GPQA DiamondReasoning#131/ 18581GPQA Diamond paper leaderboard2026-05-15
AA-LCRLong context#148/ 17952Artificial Analysis — AA-LCR2026-06-17
Family context

The three highest-scoring models with pages in each capability family. Where GPT 5.5 shows up, it's highlighted.

KnowledgeGPT 5.5 · 91
  1. 1
    GPT 5.5
    91
  2. 2
    Claude Opus 4.8
    91
  3. 3
    Claude Sonnet 4.6
    91
ReasoningGPT 5.5 · 85
  1. 1
    Claude Mythos Preview
    95
  2. 2
    Gemini 3.7 Flash
    95
  3. 3
    Grok 4.6
    95
MathGPT 5.5 · 92
  1. 1
    OpenAI o3
    99
  2. 2
    GPT-5 (medium)
    99
  3. 3
    GPT-5 (high)
    99
CodingGPT 5.5 · 96
  1. 1
    GPT 5.5
    96
  2. 2
    Claude Opus 4.8
    96
  3. 3
    Claude Opus 4.6
    96
AgenticGPT 5.5 · 100
  1. 1
    GPT 5.5
    100
  2. 2
    Claude Opus 4.8
    100
  3. 3
    Claude Fable 5
    100
Long contextGPT 5.5 · 56
  1. 1
    Muse Spark 1.2
    83
  2. 2
    Kimi K3
    83
  3. 3
    Gemini 3.5 Flash
    81
Tool useGPT 5.5 · 87
  1. 1
    Claude Sonnet 4.6
    89
  2. 2
    GPT 5.5
    87
  3. 3
    Claude Opus 4.8
    87
Human preferenceGPT 5.5 · 95
  1. 1
    GPT 5.5
    95
  2. 2
    Claude Opus 4.8
    92
  3. 3
    Gemini 3.5 Flash
    91
Newest receipts

Benchmark rows added to the public ledger for GPT 5.5 in the last 120 days. Older rows live in the full table below.

21 recent
BenchmarkFamilyScoreSourceDays ago
CritPtReasoning27.1%Artificial Analysis — CritPt5
AA-OmniscienceKnowledge57%Artificial Analysis — AA-Omniscience5
AA output speedPerformance0 t/sArtificial Analysis5
AA time to first tokenPerformance0.00sArtificial Analysis5
Artificial Analysis Intelligence IndexReasoning56.3%Artificial Analysis5
Humanity's Last ExamReasoning45.8%Artificial Analysis5
IFBenchReasoning75.85%Artificial Analysis5
SciCodeCoding56.1%Artificial Analysis5
τ³-Bench BankingAgentic38.97%Artificial Analysis5
FrontierMathMath51.7%Epoch AI FrontierMath Tiers 1-3 (v2) CSV22
Vending-Bench 2Agentic7523.84Andon Labs Vending-Bench 233
DeepSWECoding67%DeepSWE leaderboard v1.178
GDPvalAgentic1531Artificial Analysis — GDPval-AA v281
AA-LCRLong context52.1%Artificial Analysis — AA-LCR81
MCP AtlasTool use77.8%MCP Atlas leaderboard89
Vals IndexAgentic68%Vals AI — Vals Index94
SWE-bench VerifiedCoding82.5%SWE-bench Verified leaderboard97
LMArena (Chatbot Arena)Human preference1473LMArena leaderboard104
Terminal-BenchAgentic82%Terminal-Bench 2.0 leaderboard109
ARC-AGIReasoning85%ARC Prize leaderboard114
GPQA DiamondReasoning81.2%GPQA Diamond paper leaderboard114
Family coverage

A high composite that hides a weak family is a trap. These bars surface the families where this model hasn't been publicly tested, and where it leads.

Knowledge91
Reasoning85
Math92
Coding96
Agentic100
Multimodal72
Long context56
Tool use87
Safety91
Human preference95
Price vs. performance
0255075100$0.10$0.30$1$3$10$30input USD / 1M tokens · log scale →← intelligence

Hover any dot for name, score, and input price. Keyboard: tab through the top twelve, or use the ranking below.

AnthropicOpenAIMistralAlibabaDeepSeekGoogleMoonshotMetaMiniMaxxAIZhipuXiaomiOtherMeituanCohereNVIDIA

Full benchmark ledger

Every catalog benchmark for GPT 5.5. Scores link to the original source; gaps mean no public row exists yet.

31 sourced rows

31 of 37 catalog benchmarks have a sourced row for GPT 5.5.

Knowledge

Reasoning

Math

Coding

Agentic

Multimodal

Long context

Tool use

Performance

Safety

Human preference

Changelog
  1. Released GPT 5.5 with native audio, image, and 512K context.
  2. GPT 5.4 retired for general availability.
Sources