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Substitutes · Claude Sonnet 4.510 alternatives · within 10% performance · lower price

Cheaper alternatives to Claude Sonnet 4.5

Drop-in substitutes within 10% of Claude Sonnet 4.5's average benchmark, priced lower, sorted by price. Target price $3.00/M · target score 42.1.

OpenAI logo
gpt-oss-120b (free)
OpenAI
Best match
Price
Free
Score
68.7
Ctx
131K
Save 100%·163% of Claude Sonnet 4.5
Side-by-side
OpenAI logo
gpt-oss-20b (free)
OpenAI
Price
Free
Score
66.4
Ctx
131K
Save 100%·158% of Claude Sonnet 4.5
Side-by-side
Google DeepMind logo
Gemma 3 27B (free)
Google DeepMind
Price
Free
Score
42.2
Ctx
131K
Save 100%·100% of Claude Sonnet 4.5
Side-by-side
Alibaba Qwen logo
Qwen2.5 Coder 7B Instruct
Alibaba Qwen
Price
$0.030
Score
44.4
Ctx
33K
Save 99%·105% of Claude Sonnet 4.5
Side-by-side
OpenAI logo
gpt-oss-20b
OpenAI
Price
$0.030
Score
67.4
Ctx
131K
Save 99%·160% of Claude Sonnet 4.5
Side-by-side
OpenAI logo
gpt-oss-120b
OpenAI
Price
$0.039
Score
46.9
Ctx
131K
Save 99%·111% of Claude Sonnet 4.5
Side-by-side
Alibaba Qwen logo
Qwen3 8B
Alibaba Qwen
Price
$0.050
Score
56.5
Ctx
41K
Save 98%·134% of Claude Sonnet 4.5
Side-by-side
OpenAI logo
GPT-5 Nano
OpenAI
Price
$0.050
Score
45.3
Ctx
400K
Save 98%·108% of Claude Sonnet 4.5
Side-by-side
Microsoft logo
Phi 4
Microsoft
Price
$0.065
Score
43.2
Ctx
16K
Save 98%·103% of Claude Sonnet 4.5
Side-by-side
baidu logo
ERNIE 4.5 21B A3B Thinking
baidu
Price
$0.070
Score
57.0
Ctx
131K
Save 98%·135% of Claude Sonnet 4.5
Side-by-side
The cheapest drop-in alternative is gpt-oss-120b (free) at Free/M input · 100% cheaper than Claude Sonnet 4.5 with 163% of the benchmark score.