τ²-bench — cost vs performance

Best current row per canonical model in the group “pass^1 · evaluator=Artificial Analysis” (323 models) against ESTIMATED memory at 4-bit, 8K context (GB). The dashed line is the Pareto frontier: no model is both better and cheaper than a point on it.

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XOutput price Input price Parameters Context Memory (est.)Scalelog linearBubblecontext params none

open / restricted weights closed Pareto frontier (6 models)Estimated

Frontier models 6

Pareto frontier
Model	pass^1 on τ²-bench	Rank	ESTIMATED memory at 4-bit, 8K context (GB)	Provider	Trust
Z.ai GLM 5.2Z.ai (Zhipu AI) · Open weights	99.1%	1	433.7 GBest.	—	Independent
GLM 4.7 FlashZ.ai (Zhipu AI) · Open weights	98.8%	3	18.5 GBest.	—	Independent
Qwen3.6 27BQwen · Open weights	94.2%	31	16.5 GBest.	—	Independent
Qwen3.5-4BQwen · Open weights	92.1%	48	3.2 GBest.	—	Independent
Qwen3-VL-4B-InstructQwen · Open weights	23.4%	229	3.1 GBest.	—	Independent
Qwen3-0.6BQwen · Open weights	21.1%	245	0.9 GBest.	—	Independent

Methodology. Points are the best current row per canonical model in comparability group 'pass^1 · evaluator=Artificial Analysis'. Price = cheapest current offer across providers (the provider shown). Pareto frontier maximises the score and minimises x; exact ties are all kept. memory_estimate is an estimate (see /methodology). Only the selected comparability group is plotted; points under other configurations are not mixed in. Price = cheapest current offer across providers at the time of the last crawl. Nothing is estimated except where marked.