What is the IQ of opus-5.5?

opus-5.5 has an estimated IQ of 137, which ranks #3 out of 143 public models on the AI IQ leaderboard. The score combines six equally weighted reasoning dimensions using measured benchmark results and conservative estimates for missing coverage.

How much does opus-5.5 cost?

opus-5.5 costs $4.00 per million input tokens and $20.00 per million output tokens. Adjusted for how many tokens it actually consumes on real tasks, its effective cost works out to $20.57 per million input-plus-output tokens.

Is opus-5.5 open source?

No — opus-5.5 is a proprietary model. Its weights are not publicly available, so it is used through hosted APIs and products.

When was opus-5.5 released?

opus-5.5 was publicly released on September 22, 2026.

How large is the context window of opus-5.5?

opus-5.5 supports a context window of 1,000,000 tokens — the amount of text it can consider in a single request.

Anthropic

opus-5.5

Public AI IQ model profile with source-backed benchmark results and derived ranking context.

IQ

137

EQ

n/a

Effective Cost

$20.57

IQ Rank

#3

opus-5.5 API pricing — full price table, workload cost examples, and cheaper alternatives.

IQ Dimensions

Dimension	IQ	Coverage
Abstract Reasoning	131	2/3
Mathematical Reasoning	140	1/5
Academic Reasoning	145	4/6
Programmatic Reasoning	147	2/6
Computer Use	141	0/6
Reliability	121	2/7

Benchmark Results

Benchmark	Score	Dimension
AA Long Context Reasoning v1.1	84.6667	Reliability
AA Omniscience	46.4167	Reliability
ARC-AGI-1	98.5	Abstract Reasoning
ARC-AGI-2	93.3333	Abstract Reasoning
CritPt	31.7143	Academic Reasoning
Humanity's Last Exam	61.3531	Academic Reasoning
MMMU-Pro	87.6879	Academic Reasoning
ProgramBench	65	Programmatic Reasoning
ProofBench 1.1	100	Mathematical Reasoning
SciCode	66.8981	Academic Reasoning
Terminal-Bench 4.0	59.596	Programmatic Reasoning

Compare

Frequently Asked Questions

What is the IQ of opus-5.5?: opus-5.5 has an estimated IQ of 137, which ranks #3 out of 143 public models on the AI IQ leaderboard. The score combines six equally weighted reasoning dimensions using measured benchmark results and conservative estimates for missing coverage.
How much does opus-5.5 cost?: opus-5.5 costs $4.00 per million input tokens and $20.00 per million output tokens. Adjusted for how many tokens it actually consumes on real tasks, its effective cost works out to $20.57 per million input-plus-output tokens.
Is opus-5.5 open source?: No — opus-5.5 is a proprietary model. Its weights are not publicly available, so it is used through hosted APIs and products.
When was opus-5.5 released?: opus-5.5 was publicly released on September 22, 2026.
How large is the context window of opus-5.5?: opus-5.5 supports a context window of 1,000,000 tokens — the amount of text it can consider in a single request.