ByteDanceChina· released Jun 2026
Provisional: 5 comparable tests so far. Ranked once it reaches 6 across 2 counting categories.
ByteDance, China. One of 4 models from this lab on the Index.
Snapshot November 10, 2026
OpenCharts Index
57.4
Provisional: not enough comparable tests or counting categories to rank yet · 5 comparable tests · 0 counting categories
Drop any single test and the Index lands between 44.6 and 66.4.
Needs more results (0 of 5 so far)
Distance to today's frontier on the hardest tests. Not a measure of intelligence.
What it's known for
Its widest gap is on Chess Puzzles, 78.3% behind the best published result. No comparable results yet in agentic, multimodal and human preference. Between 40% and 50% behind the best published results, on average.
Strongest category
No category counts yet: a category counts once it has more than one comparable test and the model has taken at least half of them. The scores it has are below.
Best single result
Solve competition mathematics problems that have a single exact integer answer.
95.6%
95.6% of the best (100.0%) · #38 of 98.
Olympiad-style problems need long, careful chains of reasoning, and there is no partial credit.
Where it trails
Find the single best move in a chess position that is given as text, with no engine to consult.
21.0%
78.3% behind the best published result (79.0%), measured above chance · #59 of 76.
A small probe of planning and spatial reasoning. There is one right answer and no partial credit, so a lucky guess is rare.
Not measured yet
No comparable result yet in these 3 categories. A blank is a blank, never a zero, and it does not lower the Index.
Covered, but not averaged into the Index:
See it at work
Every test it has taken, by category, with the kind of task it faced, who produced the number and where the result landed against the best published one. The examples are original and illustrative, never items from the datasets themselves.
Math · mean 95.6 across 1 comparable test · not counted toward the Index yet (fewer than half the category's tests)
Solve competition mathematics problems that have a single exact integer answer.
95.6%
95.6% of the best (100.0%)
#38 of 98 · n = 45
high
45 problems: one problem is 2.2 points, so gaps of a few points are within noise.
Source: Epoch AI (internal runs)Every result is read against the best published one on its test: percent scores as a share of the best above chance, Arena ratings as the expected win rate against the board leader, open-ended values on a log scale. Sitting a harder exam never lowers a model. Every number links to the publisher that produced it.
Head to head
Choose a rival. Every counted test both have taken appears side by side as a share of the best published result on that test, with the category means above. A win is a higher share; a gap under 2 points is a tie, because one item on a 45-problem exam is 2.2 points and publishers' own standard errors are of that order.
Doubao Seed 2.1 Pro
provisional·Index 57.4C-
0 : 5
wins · 0 ties · 5 shared
GPT-6 Astra
#1·Index 93.7A
GPT-6 Astra comes out ahead on 5 of the 5 tests both have taken.
Category means
Reasoning
Knowledge
Coding
Math
Agentic
Multimodal
Human preference
Shared tests · biggest gaps first
Bars are distances to the best published result on each test (percent scores above chance, Arena ratings as win rate against the leader, open-ended values on a log scale). Raw values as the publishers report them.
Open GPT-6 AstraScores
The best published run per benchmark, the raw value as the publisher reports it, who produced the number, how close it comes to the best published result on that test, and where the model sits among every model scored on it. Percent scores are read above chance, Arena ratings as a win rate against the board leader, open-ended values on a log scale. A test with too few models to compare against is shown but not counted, and so is an archived test: one whose publisher no longer covers new models.
Category means
Mean · tests taken of the category's comparable tests. A faded category either rests on fewer than half of them or is a single-test category (marked “beside”), which is shown next to the Index and never averaged into it.
89.3%
90.1% of the best (96.4%), above chance
47th percentile of 96 · n = 198
high
Source: Epoch AI — AI Benchmarking Hub21.0%
21.7% of the best (79.0%), above chance
16th percentile of 76 · n = 100
high
Source: Epoch AI — AI Benchmarking Hub44.7%
47.6% of the best (94.0%)
46th percentile of 75 · n = 1,000
high
Source: Epoch AI — AI Benchmarking Hub1,519
15% expected win rate against the board leader (1,818)
54th percentile of 110
preview · board 2026-11-09
Source: Arena (LMArena) — Leaderboard Dataset95.6%
95.6% of the best (100.0%)
57th percentile of 98 · n = 45
high
Source: Epoch AI — AI Benchmarking HubTop of the leaderboard
29 of the models on this page run inside Theo today. Theo picks the right one for each step and always shows which engine answered.