What is the IQ of sonnet-5.5?

sonnet-5.5 has an estimated IQ of 132, which ranks #9 out of 144 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 sonnet-5.5 cost?

sonnet-5.5 costs $2.00 per million input tokens and $10.00 per million output tokens. Adjusted for how many tokens it actually consumes on real tasks, its effective cost works out to $55.83 per million input-plus-output tokens.

Is sonnet-5.5 open source?

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

When was sonnet-5.5 released?

sonnet-5.5 was publicly released on September 28, 2026.

How large is the context window of sonnet-5.5?

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

Anthropic

sonnet-5.5

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

IQ

132

EQ

n/a

Effective Cost

$55.83

IQ Rank

#9

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

IQ Dimensions

Dimension	IQ	Coverage
Abstract Reasoning	111	0/3
Mathematical Reasoning	141	1/5
Academic Reasoning	137	3/6
Programmatic Reasoning	144	2/5
Computer Use	127	0/5
Reliability	128	2/6

Benchmark Results

Benchmark	Score	Dimension
AA Long Context Reasoning v1.1	82.6667	Reliability
AA Omniscience	32.3	Reliability
CritPt	31.4286	Academic Reasoning
Humanity's Last Exam	54.9583	Academic Reasoning
IOI V2	83.056	Programmatic Reasoning
ProofBench 1.1	100	Mathematical Reasoning
SciCode	60.9954	Academic Reasoning
Terminal-Bench 4.0	63.6364	Programmatic Reasoning

Compare

Frequently Asked Questions

What is the IQ of sonnet-5.5?: sonnet-5.5 has an estimated IQ of 132, which ranks #9 out of 144 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 sonnet-5.5 cost?: sonnet-5.5 costs $2.00 per million input tokens and $10.00 per million output tokens. Adjusted for how many tokens it actually consumes on real tasks, its effective cost works out to $55.83 per million input-plus-output tokens.
Is sonnet-5.5 open source?: No — sonnet-5.5 is a proprietary model. Its weights are not publicly available, so it is used through hosted APIs and products.
When was sonnet-5.5 released?: sonnet-5.5 was publicly released on September 28, 2026.
How large is the context window of sonnet-5.5?: sonnet-5.5 supports a context window of 1,000,000 tokens — the amount of text it can consider in a single request.