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ModelScale

GPT-5.5 Pro

OpenAI · Proprietary · rank 52 · bench-align-v5

Compare this model Model a workload
Canonical idgpt-5-5-pro
Overall score61.68
Context window1M tokens
Release date2026-04-23
Access typeProprietary
Blended $/1M$67.5075% input / 25% output

Capability shape

Seven axes from the ranking source. A missing axis is drawn as a gap.

Capability evidence

Agentic80.6
CodingUnavailable
Knowledge79.8
ReasoningUnavailable
Multimodal & GroundedUnavailable
Instruction FollowingUnavailable
Math70.2

Runtime service evidence

Measured values with the date they were observed. Nothing is inferred from a sibling model or a provider claim.

Time to first token: latency to the first answer chunk (Artificial Analysis, via BenchLM). Reasoning models include thinking time, so values can run to tens or hundreds of seconds.

Evidence key: ObservedUnavailable

Runtime measurements
MeasurementValueObservedLast goodEvidence
Time to first tokenUnavailableUnavailableUnavailable
ThroughputUnavailableUnavailableUnavailable

Regional or per-endpoint measurements appear only when the API supplies them; none are modelled here.

Endpoint and price matrix

Every published price component, including cache reads and writes.

Price components
ComponentUSDEvidence
Input / 1M tokens$30.00
Output / 1M tokens$180.00
Cache read / 1M tokensUnavailable
Cache write / 1M tokensUnavailable
Blended / 1M (75% input / 25% output)$67.50
Self-hosted listingOpenAI's current API pricing page lists gpt-5.5-pro at $30.00 input / $180.00 output per million tokens for short-context requests and does not list a cached-input rate.The rates above are a hosted price matched from another provider, not a first-party list price.

Workload-aware monthly cost example

10 conversations per day × 8 messages × 22 active days, 1200 input and 400 output tokens per message, no cache. This uses the same calculator as the cost simulator, so an unavailable applicable rate makes the example unavailable too.

Modelled monthly cost$190.08
Modelled tokens2.82M
Open the simulatorChange this workload

Benchmark record

7 matched benchmark rows with their published value, unit, and provenance.

Knowledge

Knowledge benchmarks
BenchmarkValueTasksDifficultyProvenance
HLE
Humanity's Last Exam
57.2Expert-level questionsFrontier expert levelHumanity's Last Exam
HLE w/o tools
Humanity's Last Exam without tools
43.1Expert-level questionsFrontier expert levelIntroducing GPT-5.4 mini and nano

Mathematics

Mathematics benchmarks
BenchmarkValueTasksDifficultyProvenance
FrontierMath (legacy)
FrontierMath legacy aggregate
52.4Historical aggregateResearch-level mathematicsFrontierMath: A Benchmark for Evaluating Advanced Mathematical Reasoning in AI
FrontierMath v2 (Tiers 1-3)
FrontierMath v2 Tiers 1-3
51.000295 private advanced mathematics problemsFrom olympiad-plus to early research mathematicsFrontierMath v2 benchmark hub
FrontierMath v2 (Tier 4)
FrontierMath v2 Tier 4
39.60043 private extreme-difficulty mathematics problemsResearch-level mathematics requiring hours or days of expert workFrontierMath Tier 4 v2 leaderboard

Reasoning

Reasoning benchmarks
BenchmarkValueTasksDifficultyProvenance
CritPt
Critical Physics Tasks
30.6Research-level physics questionsResearch-level physics reasoningCritPt Benchmark Leaderboard

Agentic

Agentic benchmarks
BenchmarkValueTasksDifficultyProvenance
BrowseComp
BrowseComp
90.1Research questions requiring browsingHard web researchBrowseComp

Lifecycle and limitations log

Lifecycle events the source associates with this model, plus what this profile does not claim.

No lifecycle event references this model.

That is not evidence the model has no lifecycle plan — only that this source published none.

What this profile does not claimValues are reproduced exactly as their sources published them, in the units those sources declared; none are converted, interpolated, or averaged across providers. Any field marked unavailable was attempted and not returned — the attempt timestamp is in each badge. Last attempted fetch for this model’s score: 2026-09-17 17:17 UTC.