OpenAIproprietary
Released: 2026-07-09GPT-5.5 Thinking
OpenAI extended thinking model balancing deep chain-of-thought verification with rapid generation speeds.
Intelligence Index
94.0/ 100
Calibrated multi-domain compositeThroughput Speed
70tok/sec
Output streaming throughputTime To First Token
390ms
Initial chunk server latencyLiveBench Contam-Free
80.2%
September 2026 suite scoreLiveBench Multi-Domain Evaluation Breakdown
Monthly refreshed contamination-free test setsLogical Reasoning89.7%
Coding & Repo Repair82.1%
Mathematics (AIME)95.9%
Data Analysis & Tables78.4%
Language & Comprehension73.1%
Instruction Following68.0%
Sourced Benchmark Evaluations (3)
Verified performance across authoritative benchmarks with provenance tracking.OpenAI Compatible API ExecutionAPI Ready
from openai import OpenAI
client = OpenAI()
response = client.chat.completions.create(
model="gpt-5-5-thinking",
messages=[{"role": "user", "content": "Evaluate multi-step logic problem"}],
temperature=0.2
)
print(response.choices[0].message.content)Evaluation & Sourcing Notes
Scores listed for GPT-5.5 Thinking represent verified evaluations extracted from official research papers, independent evaluation suites (HELM, LMSYS, OpenCompass, LiveBench), and verified audit reports.
All benchmarks marked as saturated or deprecated reflect historical performance where the benchmark no longer provides active discriminative power.