τ²-bench benchmark

315 AI models ranked on τ²-bench. Each row shows the model’s score next to its cheapest API price per 1M tokens where it has one, so you can weigh quality against cost.

Top model today

GLM 5.2 (Zhipu) leads at 99%, from $0.05 per 1M input OpenRouter routed quote.

Data via GitHub: sierra-research/tau2-bench →

Models ranked

315

on this benchmark

Top score

99%

current leader

Type

Single eval

benchmark

Updated

Oct 14, 2026

benchmark scores

Cost vs τ²-bench

202 priced models
Most attractive quadrant (cheap + high)
= reasoning model (extended thinking)

Each labelled name links to that model’s page. Curated to the cost-efficiency frontier, top scorers and cheapest so labels stay readable; the full field is in the leaderboard table below (and via “select all”). Reasoning models (extended “thinking” before answering) carry a ring around the dot.

Models ranked on τ²-bench

highest score first · 315 models
Maker
#
1GLM 5.2Zhipu99%
$0.05
Routed quote
$1.98
via Scx AI
2JT-35B-FlashChina-mobile99%
n/a
n/a
3GLM 4.7 FlashZhipu99%
$0.06
via DeepInfra
$0.40
via Amazon Bedrock
4Claude Fable 5Anthropic99%
$10.00
via Anthropic
$50.00
via Anthropic
5Step 3.7 FlashOther99%
$0.20
via DeepInfra
$1.15
via DeepInfra
6GLM 5V TurboZhipu99%
$0.704
via Aihubmix
$3.10
via Aihubmix
7GLM 5 TurboZhipu99%
$1.20
via Novita
$4.00
via Novita
8GLM 5Zhipu98%
$0.60
via DeepInfra
$1.92
Routed quote
9GLM 5.1Zhipu98%
$1.05
via DeepInfra
$3.50
via DeepInfra
10Grok 4.3xAI98%
$1.25
via xAI
$2.50
via xAI
11Qwen3.6 PlusAlibaba98%
$0.325
Routed quote
$1.95
Routed quote
12Grok 4 20 0309xAI96%
$1.25
via xAI
$2.50
via xAI
13DeepSeek V4 Pro 0423DeepSeek96%
$0.435
via Tencent
$0.87
via Tencent
14Kimi K2.6Moonshot96%
$0.65
via Wandb
$3.40
via Novita
15Kimi K2.5Moonshot96%
$0.45
via DeepInfra
$2.25
via DeepInfra
16GLM 4.7Zhipu96%
$0.40
via DeepInfra
$1.75
via DeepInfra
17Qwen3.6 Max PreviewAlibaba96%
n/a
n/a
18DeepSeek V4 Flash 0423DeepSeek96%high
$0.09
via DeepInfra
$0.18
via DeepInfra
19Qwen3.5 397B A17BAlibaba96%
$0.164
via Aihubmix
$0.986
via Aihubmix
20Gemini 3.5 FlashGoogle96%medium
$1.50
via Google
$9.00
via Google
21Gemini 3.1 Pro PreviewGoogle96%
$2.00
via Google
$12.00
via Google
22MiniMax M2.5MiniMax95%
$0.27
Routed quote
$1.08
Routed quote
23Qwen3.6 35B A3BAlibaba95%
$0.05
via Sail
$0.40
via Sail
24Mimo V2 FlashXiaomi95%reasoning: true
$0.10
Routed quote
$0.30
Routed quote
25Mimo V2 ProXiaomi95%
$1.10
via Aihubmix
$3.30
via Aihubmix
26Qwen3.7 MaxAlibaba95%
$1.25
via Novita
$3.75
via Novita
27Claude Opus 4.8Anthropic94%
$5.00
via Anthropic
$25.00
via Anthropic
28Step 3.5 Flash (0202)Stepfun94%
n/a
n/a
29Qwen3.6 27BAlibaba94%
$0.15
via Libertai
$0.50
via Libertai
30MiMo-V2.5-ProXiaomi94%
$0.435
Routed quote
$0.87
Routed quote
31Mistral Medium 3.5Mistral94%
$1.50
via Mistral
$7.50
via Mistral
32GPT-5.5OpenAI94%
$5.00
via OpenAI
$30.00
via OpenAI
33Qwen3.5-27BAlibaba94%
$0.26
via DeepInfra
$2.40
via Novita
34Qwen3.5-122B-A10BAlibaba94%
$0.113
via Aihubmix
$0.901
via Aihubmix
35Grok 4.1 Fast ReasoningxAI93%
$0.20
via Azure
$0.50
via Azure
36MiMo-V2-Flash (Feb 2026) (0206)Xiaomi93%
n/a
n/a
37Tri-21B-think PreviewTrillion-labs93%
n/a
n/a
38Kimi K2 ThinkingMoonshot93%
$0.60
via Moonshot
$1.20
via Gmi
39Qwen3.7 PlusAlibaba93%
$0.282
via Aihubmix
$1.13
via Aihubmix
40Grok 4.20xAI93%
$1.25
via xAI
$2.50
via xAI
41JT-MINIChina-mobile93%
n/a
n/a
42Hy3 previewTencent93%
$0.18
Routed quote
$0.60
Routed quote
43Nova 2.0 Pro PreviewAmazon93%medium
n/a
n/a
44inclusionAI: Ring-2.6-1TOther92%
n/a
n/a
45Claude Opus 4.6Anthropic92%reasoning: adaptive
$5.00
via Anthropic
$25.00
via Anthropic
46GPT-5.2-CodexOpenAI92%
$1.75
via Databricks
$14.00
via Databricks
47Qwen3.5 4BAlibaba92%
n/a
n/a
48Muse SparkMeta92%
n/a
n/a
49Mimo V2 OmniXiaomi91%
$0.44
via Aihubmix
$2.20
via Aihubmix
50DeepSeek V3.2DeepSeek91%reasoning: true
$0.259
Routed quote
$0.38
via DeepInfra
1–50 of 316
Page 1 of 7
On-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower. Cost per task uses best-effort token usage. An OpenRouter routed quote is the price of whichever upstream provider OpenRouter prefers today, so it moves day to day.

Frequently asked questions

What is the τ²-bench benchmark?

Sierra Research's τ²-bench evaluates LLM agents in realistic multi-turn customer-service scenarios (airline, retail, telecom) where both the agent and a simulated user take actions using tools under domain policies. Scored on task success (final vs goal state) and on pass^k reliability across repeated attempts.

Which AI model scores highest on τ²-bench?

GLM 5.2 (Zhipu) leads with 99%, from $0.05 per 1M input tokens as an OpenRouter routed quote.

How many models are ranked on τ²-bench?

315 models carry a τ²-bench score. Scores come from Artificial Analysis; where a model has a listed API price it is drawn from LiteLLM and OpenRouter, and models with no current price are listed without one.

Other benchmarks

compare the same models on a different eval
Benchmark scores via Artificial Analysis · scores updated Oct 14, 2026 · Listed prices from LiteLLM, OpenRouter and Vercel · catalogue refreshed Oct 14, 2026 · 129 prices older, back to Jul 19, 2026

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