ToolcallFormatIFBench
Qwen 3.6 Max (Preview) 86.1% leads since April 2026 Models make tool calls that must follow format rules across many agent scaffolds and tool sets. Qwen uses it to measure real-world tool call following.
In-house. Defined in one footnote of the Qwen3.6-Max-Preview post.
- Made by
- Qwen Team, Alibaba Group
- Released
- April 2026
- Kind
- Function calling
- Level
- Everyday
- Scored
- Checked automatically
- Answers
- Agent task
- Tasks
- Kept private
- Strongest model tested
- Claude Opus 4.5 #61 on the capability index
- Last in a launch post
- April 2026, dropped after it saturated
- Last model added
- April 2026
- Scores refreshed
- November 12th, 2026
Qwen 3.6 Max (Preview) leads with 86.1% among models released by April 2026
Best score per model from the benchmark's own leaderboard, read on November 12th, 2026. Where a model ran with several settings or harnesses, we keep its best.
The newest model with a score here came out in April 2026, and nobody has tested a newer one. Among the 20 highest-ranked models on the capability index, these have no score yet:
- Claude Fable 5.2
-
Gemini 4 Carbon - GPT-6 Astra
- Claude Opus 5.5
- and 16 more
- 1 Qwen 3.6 Max (Preview) 86.1%
- 2 Claude Opus 4.5 84.2%
- 3 Qwen 3.6 Plus 83.3%
- 4 Qwen3.5-Plus 80.1%
- 5 GLM-5.1 60.1%
Source: Official ToolcallFormatIFBench leaderboard
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | Qwen 3.6 Max (Preview) | 86.1% | Apr 2026 | Official leaderboard | |
| 2 | Claude Opus 4.5 | 84.2% | Nov 2025 | Official leaderboard | |
| 3 | Qwen 3.6 Plus | 83.3% | Mar 2026 | Official leaderboard | |
| 4 | Qwen3.5-Plus | 80.1% | Feb 2026 | Official leaderboard | |
| 5 | GLM-5.1 | 60.1% | Apr 2026 | Official leaderboard |
Labs report scores for 1 model in their cards. We plot every source in the charts below.
2 models have held number one on the official leaderboard since its release in April 2026
Lab claims count from the day the card came out, independent runs from the model’s release.
Source: Official ToolcallFormatIFBench leaderboard
Qwen 3.6 Max (Preview) on the official leaderboard passed 85% in April 2026
All the scores we have, one dot each, so a model tested at several settings appears more than once.
Sources: Official ToolcallFormatIFBench leaderboard and labs’ model cards
Labs headline it less often now, last in April 2026
Launch posts from every lab that has listed it, one tick per post. Tall colored ticks include it, and short gray ones leave it out.
| Date | Launch post | Score | As the post writes it |
|---|---|---|---|
| Apr 20, 2026 | Qwen 3.6 Max (Preview) | 86.1 | ToolcallFormatIFBench Real-World Toolcall Following |
One lab claim next to the leaderboard
Each score a lab reported for its own model, beside the same model's best score on the leaderboard. Gaps mostly come from different harnesses, effort levels and task subsets. 1 of them match, which usually means one side copied the other. Every benchmark.
| Model | Lab says | Board says | Gap |
|---|---|---|---|
| Qwen 3.6 Max (Preview) | 86.1% ToolcallFormatIFBench Real-World Toolcall Following | 86.1% Leaderboard | Same |
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