Claude 4.5 Sonnet: benchmark scores, price and ranking

Claude 4.5 Sonnet from Anthropic ranks #143 of 743 LLMs on the LLMs Tiger aggregate benchmark score (51.2), based on 2 benchmark results captured up to 2026-10-13.

Organisation: Anthropic
Type: Frontier model
Open weights: No
Released: 2025-09-29 (source: curated)
Cheapest API price: $3.00 in / $15.00 out per million tokens (via replicate, observed 2026-10-13T20:47Z)
Aggregate rank: #143 of 743 (score 51.2)

Across the 2 benchmarks where at least ten models are scored, Claude 4.5 Sonnet is in the top 10% on 0 and in the top half on 1.

Its cheapest listed input price, $3.00 per million tokens, is lower than that of 11% of the 427 models with a listed price.

Claude 4.5 Sonnet benchmark results

Claude 4.5 Sonnet benchmark scores, ranked against all models measured on each benchmark
Benchmark	Score	Rank	Source	Captured
SWE-bench Verified	70.6%	#19 of 73	SWE-bench Verified leaderboard	2026-10-13
SWE-bench Multilingual	67.0%	#8 of 11	SWE-bench Multilingual leaderboard	2026-10-13

About Claude 4.5 Sonnet

Claude 4.5 Sonnet is a frontier model from Anthropic. It was released on 2025-09-29, according to the developer's announcement. The cheapest API listing we track charges $3.00 per million input tokens and $15.00 per million output tokens, through replicate. We hold 2 benchmark results for it across 2 areas, and none is in the top tenth of its board.

Where Claude 4.5 Sonnet stands

On our aggregate score, Claude 4.5 Sonnet is #143 of 743 ranked models, in the top quarter. Its score is 51.2; the scale is centred on 50, so it sits 1.2 points above the typical model. That beats 81% of the ranked field. Among the 70 ranked Anthropic models it is #24. The next one up is Claude Opus 4.6 (120K, Low) at 51.2. The next one down is Claude 4 Opus at 51.0.

Claude 4.5 Sonnet, benchmark by benchmark

SWE-bench Verified puts Claude 4.5 Sonnet at 70.6%, #19 of 73. That beats 74% of the models tested, but 12.9 points short of Claude Opus 4.7 (max) (83.5%). The results either side are Claude Opus 4 (70.7%) and DeepSeek-V3.2 (70.0%). It covers real GitHub issues resolved. The board median is 56.4%, so Claude 4.5 Sonnet is 14.2 points above it. Source: SWE-bench Verified leaderboard, captured 2026-10-13.

Claude 4.5 Sonnet lands below the middle on SWE-bench Multilingual: 67.0%, #8 of 11, with 64% of the field scoring higher. Gemini 3 Flash leads at 72.7%; the closest result above is Kimi K2.5 at 67.3%. It covers real GitHub issues resolved. The board median is 68.3%, so Claude 4.5 Sonnet is 1.3 points below it. Source: SWE-bench Multilingual leaderboard, captured 2026-10-13.

Strengths and weaknesses

Claude 4.5 Sonnet has too few results on boards with ten or more models to say where it is strong or weak. Treat any single score as a data point, not a verdict.

Price and value

The median input price across the 427 priced models is $0.500 per million tokens, so Claude 4.5 Sonnet costs more than the typical listing. Models that score within 1.5 points or better and cost less: DeepSeek V4 Flash 0731 (max) ($0.016, 53.1), Qwen3.7 Flash ($0.030, 50.5), GLM-5.2 (high) ($0.060, 51.6). Similar scores cost more on Muse Wonder (max) ($4.00) and Claude Opus 4.6 (max) ($5.00).

Release history

The Anthropic model released before it was Claude Opus 4.1 (unknown thinking) on 2025-08-05, which scores 49.1. The next one was Claude Sonnet 4.5 (59k thinking) on 2025-09-29, at 50.6.

Reading these numbers

The 2 scores on this page come from 2 sources: SWE-bench Multilingual leaderboard (1), SWE-bench Verified leaderboard (1). 2 of them come from an official leaderboard and 0 from datasets or third-party runs. With 2 results the aggregate rank can move a lot when one new score arrives.

Models ranked nearby

#140 Gemini 2.5 Pro Exp (Mar 2025) (51.2)
#141 GLM-5.1-FP8 (51.2)
#142 Llama 3.1-405B (51.2)
#144 GPT-5 (high) (51.1)
#145 Claude Code + Fable 5 (51.1)
#146 Qwen3.5 397B-A17B (51.1)