555
Ladder Elo · rank 2 of 16
- Unit
- ladder Elo, higher is better
- Range
- 396 to 765
- Sample
- 8 games
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 29 Sep 2026
- Not shown
- Not a business skill: chess against an engine on a real clock, used here as a speed-under-pressure signal.
0.5 s
Median move time · rank 1 of 16
- Unit
- milliseconds, lower is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 29 Sep 2026
- Not shown
- Not general response speed: replies are one short move.
93.7%
Content quality · rank 16 of 18
- Unit
- % of checks, higher is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 30 Sep 2026
- Not shown
- Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
0.0%
Failed outputs · rank 1 of 18
- Unit
- % of products, lower is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 30 Sep 2026
- Not shown
- Not a provider outage: provider errors are retried before a product counts as failed.
0.0%
Publish-ready listings · rank 15 of 18
- Unit
- % of products, higher is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 30 Sep 2026
- Not shown
- Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
0.0%
Reliably publish-ready · rank 10 of 18
- Unit
- % of products, higher is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 30 Sep 2026
- Not shown
- Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
9.12
Unsupported claims · rank 17 of 18
- Unit
- claims per product, lower is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 30 Sep 2026
- Not shown
- Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
95.8%
Channel compliance · rank 16 of 18
- Unit
- % of products, higher is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 30 Sep 2026
- Not shown
- Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
90.9%
Conflicts caught · rank 17 of 18
- Unit
- % of conflicts, higher is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 30 Sep 2026
- Not shown
- Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
94.5%
Content quality · rank 16 of 18
- Unit
- % of checks, higher is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 30 Sep 2026
- Not shown
- Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
$0.0080
Cost per product · rank 6 of 18
- Unit
- US dollars, lower is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 30 Sep 2026
- Not shown
- Not your cost: prices are those charged through OpenRouter on the run date.
90.5%
Decision accuracy · rank 16 of 18
- Unit
- % of decisions, higher is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 30 Sep 2026
- Not shown
- Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
0.0%
Failed outputs · rank 1 of 18
- Unit
- % of products, lower is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 30 Sep 2026
- Not shown
- Not a provider outage: provider errors are retried before a product counts as failed.
91.7%
Field accuracy · rank 15 of 18
- Unit
- % of missing fields, higher is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 30 Sep 2026
- Not shown
- Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
0.0%
Invented values · rank 1 of 18
- Unit
- % of filled values, lower is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 30 Sep 2026
- Not shown
- Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
15.5%
Publish-ready listings · rank 15 of 18
- Unit
- % of products, higher is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 30 Sep 2026
- Not shown
- Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
5.4%
Reliably publish-ready · rank 15 of 18
- Unit
- % of products, higher is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 30 Sep 2026
- Not shown
- Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
3.07
Unsupported claims · rank 16 of 18
- Unit
- claims per product, lower is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 30 Sep 2026
- Not shown
- Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
$0.15
Cost of a run · rank 5 of 17
- Unit
- US dollars, lower is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 29 Sep 2026
- Not shown
- Not your cost: prices are those charged through OpenRouter on the run date.
3
Months over budget · rank 17 of 17
- Unit
- months of 12, lower is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 29 Sep 2026
- Not shown
- Not real ad performance: the market is a deterministic simulation of one invented skincare brand.
15.2
Overall score · rank 17 of 17
- Unit
- score out of 100, higher is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 29 Sep 2026
- Not shown
- Not real ad performance: the market is a deterministic simulation of one invented skincare brand.
−£0.17
Return on ad spend · rank 16 of 17
- Unit
- profit per £1 spent, higher is better
- Configuration
- Mistral Medium 3.5, provider default reasoning
- Measured
- 29 Sep 2026
- Not shown
- Not real ad performance: the market is a deterministic simulation of one invented skincare brand.
-0.16
Confirmed task success · rank 40 of 46
- Unit
- IPS effect estimate, higher is better
- Range
- -0.20 to -0.13
- Sample
- 6429 observations
- Configuration
- Mistral Medium 3.5
- Measured
- 28 Sep 2026
- Not shown
- Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.
-0.15
Praise over complaint · rank 38 of 46
- Unit
- IPS effect estimate, higher is better
- Range
- -0.19 to -0.11
- Sample
- 2310 observations
- Configuration
- Mistral Medium 3.5
- Measured
- 28 Sep 2026
- Not shown
- Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.
-0.07
Steerability · rank 31 of 46
- Unit
- IPS effect estimate, higher is better
- Range
- -0.10 to -0.04
- Sample
- 7189 observations
- Configuration
- Mistral Medium 3.5
- Measured
- 28 Sep 2026
- Not shown
- Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.
-0.02
Tool grounding · rank 44 of 46
- Unit
- IPS effect estimate, higher is better
- Range
- -0.03 to -0.02
- Sample
- 357598 observations
- Configuration
- Mistral Medium 3.5
- Measured
- 28 Sep 2026
- Not shown
- Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.
1,430
Overall · rank 84 of 177
- Unit
- Arena rating, higher is better
- Range
- 1,424 to 1,436
- Sample
- 11632 votes
- Configuration
- Mistral Medium 3.5
- Measured
- 25 Sep 2026
- Not shown
- Not an error rate: claims that cannot be checked on the web are skipped, and preference still carries most of the weight.
1,430
Business, management and finance · rank 67 of 402
- Unit
- Arena rating, higher is better
- Range
- 1,417 to 1,443
- Sample
- 2256 votes
- Configuration
- Mistral Medium 3.5
- Measured
- 25 Sep 2026
- Not shown
- Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
1,398
Creative writing · rank 79 of 407
- Unit
- Arena rating, higher is better
- Range
- 1,384 to 1,412
- Sample
- 1999 votes
- Configuration
- Mistral Medium 3.5
- Measured
- 25 Sep 2026
- Not shown
- Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
1,434
Expert prompts · rank 93 of 359
- Unit
- Arena rating, higher is better
- Range
- 1,416 to 1,451
- Sample
- 1205 votes
- Configuration
- Mistral Medium 3.5
- Measured
- 25 Sep 2026
- Not shown
- Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
1,421
Instruction following · rank 77 of 409
- Unit
- Arena rating, higher is better
- Range
- 1,411 to 1,431
- Sample
- 3827 votes
- Configuration
- Mistral Medium 3.5
- Measured
- 25 Sep 2026
- Not shown
- Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
1,426
Overall · rank 95 of 409
- Unit
- Arena rating, higher is better
- Range
- 1,420 to 1,433
- Sample
- 11693 votes
- Configuration
- Mistral Medium 3.5
- Measured
- 25 Sep 2026
- Not shown
- Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
1,404
Writing, literature and language · rank 88 of 408
- Unit
- Arena rating, higher is better
- Range
- 1,392 to 1,415
- Sample
- 2919 votes
- Configuration
- Mistral Medium 3.5
- Measured
- 25 Sep 2026
- Not shown
- Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
60.0%
Requested-length error · rank 323 of 370
- Unit
- % off the requested word count, lower is better
- Configuration
- mistral-medium-3-5
- Measured
- 21 May 2026
- Not shown
- Not other format limits such as character counts or bullet counts.
18.0%
Requested-length error · rank 150 of 370
- Unit
- % off the requested word count, lower is better
- Configuration
- mistral-medium-3-5
- Measured
- 21 May 2026
- Not shown
- Not other format limits such as character counts or bullet counts.
0.31
Style adherence · rank 313 of 370
- Unit
- score from 0 to 1, higher is better
- Configuration
- mistral-medium-3-5
- Measured
- 21 May 2026
- Not shown
- Not brand voice on your own examples: UGI's prompts are private and lean towards creative writing.
0.35
Style adherence · rank 190 of 370
- Unit
- score from 0 to 1, higher is better
- Configuration
- mistral-medium-3-5
- Measured
- 21 May 2026
- Not shown
- Not brand voice on your own examples: UGI's prompts are private and lean towards creative writing.
43.9
Writing score · rank 185 of 370
- Unit
- score out of 100, higher is better
- Configuration
- mistral-medium-3-5
- Measured
- 21 May 2026
- Not shown
- Not business copy quality: UGI's prompts are private and lean towards creative writing, and models that often refuse get no score.
45.5
Writing score · rank 174 of 370
- Unit
- score out of 100, higher is better
- Configuration
- mistral-medium-3-5
- Measured
- 21 May 2026
- Not shown
- Not business copy quality: UGI's prompts are private and lean towards creative writing, and models that often refuse get no score.