Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...
Tested on 31 benchmarks · BenchGecko score 44.6. Top scores: MATH level 5 (97.7%), OTIS Mock AIME 2024-2025 (77.8%), GPQA diamond (76.4%).
gpt-oss-20b scores 45.0 (101% as good) at $0.02/1M input · 99% cheaper
Real-world software engineering tasks from GitHub issues. Models must diagnose bugs and write patches that pass test suites. Human-verified subset of SWE-bench.
SWE-bench Verified solved using only bash commands, no specialized frameworks. Tests raw terminal-based problem solving.
Capture-the-flag cybersecurity challenges. Tests vulnerability analysis, reverse engineering, cryptography, and exploitation skills.
Abstraction and Reasoning Corpus. Tests fluid intelligence through novel visual pattern recognition puzzles. Core measure of general intelligence.
Deceptively simple questions that humans find easy but AI models often get wrong. Tests common sense and reasoning gaps.
ARC-AGI 2, harder sequel to ARC. More complex abstract reasoning patterns that test generalization ability beyond training data.
Competition-level math from AMC, AIME, and olympiad problems. Level 5 is the hardest tier, requiring creative problem-solving.
Mock AIME (American Invitational Mathematics Exam) problems from OTIS. Tests mathematical competition performance.
- Typemultimodal
- Context1.0M tokens (~500 books)
- ReleasedSep 2025
- LicenseProprietary
- StatusActive
- Cost / Message~$0.021
Frequently Asked Questions
Key facts · as of 2026-10-05
- Claude Sonnet 4.5 by Anthropic. BenchGecko score 44.6, rank 174 of 312 scored models (normalized average of public benchmark scores).
- List price $3.00 input · $15.00 output per 1M tokens (as of 2026-10-05).
- Sold by 7 providers (as of 2026-10-05): Amazon Bedrock $3.00 in / $15.00 out · Anthropic $3.00 in / $15.00 out · Azure $3.00 in / $15.00 out · Claude Platform on AWS $3.00 in / $15.00 out · Google $3.00 in / $15.00 out · and 2 more. Every provider
How to cite · data as of 2026-10-05
Claude Sonnet 4.5 · benchmarks, pricing and providers. BenchGecko, data as of 2026-10-05. https://benchgecko.ai/model/claude-sonnet-4-5
Credit "Source: BenchGecko" with a link. Prices per provider and Gecko Tests are BenchGecko data (CC BY 4.0); benchmark scores keep their original source, listed in the JSON. JSON · llms.txt · MCP