Why does GPT 5.1 Instant have no BenchLeader Index score?

The index needs at least five independent results across at least two categories; as of 25 Oct 2026 GPT 5.1 Instant has 4 that count. Launch-post scores are never used, so it is ranked once independent publishers have measured it.

OpenAI Compare with another model

GPT 5.1 Instant

GPT 5.1 Instant is an OpenAI proprietary model. It is not yet ranked: 4 independent results so far, and the index needs at least five across two categories. Last measured 7 Oct 2026.

Blended price: –
Output speed: –
First answer: –
Context: –
Full answer: –
Cost per run: –
Released: –; date not published by our sources

How it scores by categoryDashed line = average model (50). One step of 15 = one standard deviation.

Knowledge35
Instruction following42
Multimodal39

Versions

OpenAI has shipped 2 models under this name. Each is ranked on its own results; a newer version often has fewer results so far, which holds its index nearer the average until more arrive.

Model	Released	Index	Rank
GPT-5.5 Instant	5 May 2026	58.0	#164
GPT 5.1 Instantthis page	–	–	–

Benchmark results

See all LLM benchmarks. One column per reasoning effort. Rank is among every configuration of every model on that benchmark. Hover a score for the run it came from.

Knowledge

Benchmark	not stated	Source
MultiNRCpossible contamination	18.3%#36	Scale AI SEAL

Instruction following

Benchmark	not stated	Source
MultiChallenge	51.2%#26	Scale AI SEAL
TutorBench	49.1%#20	Scale AI SEAL

Multimodal

Benchmark	not stated	Source
VISTA	34.9%#44	Scale AI SEAL

Safety & honesty

Benchmark	not stated	Source
FORTRESSnot in index	30.4%#23	Scale AI SEAL
MASKnot in indexpossible contamination	63.3%#32	Scale AI SEAL

New this month

Questions people ask

Why does GPT 5.1 Instant have no BenchLeader Index score?: The index needs at least five independent results across at least two categories; as of 25 Oct 2026 GPT 5.1 Instant has 4 that count. Launch-post scores are never used, so it is ranked once independent publishers have measured it.

Data as of 25 Oct 2026. Compare with another model.

Cite as: BenchLeader, “GPT 5.1 Instant: benchmarks, pricing, speed and rank”, data as of 25 Oct 2026, https://www.benchleader.com/models/gpt-5-1-instant.