Answer the same prompt as a rival model; real users vote blind on which answer they prefer.
1,491
48% expected win rate against the board leader (1,507)
#9 of 92
high · board 2026-09-02
Source: ArenaGoogleUnited States· released Aug 2026
Ranked #12, 24.8% behind the frontier on average.
Google, United States. One of 14 models from this lab on the Index.

Available in Theo as Theo Fast
Theo orchestrates it for the steps it does best and always shows which engine answered.
Snapshot September 8, 2026
OpenCharts Index
75.2
Ranked #12 (9 to 16) of 36 · 24.8% behind the frontier on average · 14 comparable tests · 3 counting categories
Drop any single test and the Index lands between 71.9 and 79.5, anywhere from #9 to #16. Neighbours inside that range are ties.
Needs more results (3 of 8 so far)
Averaging 67.6 on the 3 it has; the score opens at 4 of 8.
Distance to today's frontier on the hardest tests. Not a measure of intelligence.
What it's known for
Strongest in reasoning (82.2) and coding (76.2). It trails the frontier most in math, 32.7% behind on average. No comparable results yet in agentic, multimodal and long context. Between 20% and 25% behind the best published results, on average. Drop any single test and it would sit anywhere from #9 to #16.
Strongest category
Reasoning
Hard, novel problems: graduate science, abstract puzzles, expert exams.
82.2
Mean of 4 of the category's 6 comparable tests. Counts toward the Index.
Best single result
Answer a PhD-level multiple-choice question in physics, chemistry or biology that a web search will not settle.
94.8%
98.7% of the best (95.8%), above chance · #2 of 78.
Expert-level science questions are the closest thing to asking a specialist colleague. A model that gets them right can check a technical claim instead of echoing it.
Where it trails
Solve the hardest FrontierMath tier: problems that take expert mathematicians days.
36.6%
62.5% behind the best published result (97.6%) · #17 of 51.
The deepest end of the set. Progress here signals genuinely new capability.
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.
Human preference · mean 95.3 across 1 comparable test · a single-test category, shown beside the Index and never averaged into it
Answer the same prompt as a rival model; real users vote blind on which answer they prefer.
1,491
48% expected win rate against the board leader (1,507)
#9 of 92
high · board 2026-09-02
Source: ArenaEvery 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.
Gemini 3.7 Flash
#12·Index 75.2B
1 : 10
wins · 1 tie · 12 shared
GPT-6 Astra
#1·Index 99.0A+
GPT-6 Astra comes out ahead on 10 of the 12 tests both have taken.
Category means
Reasoning
Knowledge
Coding
Math
Agentic
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.
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.
94.8%
98.7% of the best (95.8%), above chance
99th percentile of 78 · n = 198
high
Source: Epoch AI — AI Benchmarking Hub84.6%
89.0% of the best (95.0%)
84th percentile of 51 · n = 120
high
Source: Epoch AI — AI Benchmarking Hub95.5%
97.0% of the best (98.5%)
82th percentile of 51 · n = 100
high
Source: Epoch AI — AI Benchmarking Hub14.3%
44.2% of the best (32.3%)
65th percentile of 78
high
Source: Epoch AI — AI Benchmarking Hub69.2%
91.5% of the best (75.6%)
91th percentile of 57 · n = 1,000
high
Source: Epoch AI — AI Benchmarking Hub57.9%
93.3% of the best (62.0%)
93th percentile of 73 · n = 338
medium
Source: Epoch AI — AI Benchmarking Hub43.6%
81.5% of the best (53.5%)
69th percentile of 27
harness: chisel · reasoning effort: medium
Source: Epoch AI — AI Benchmarking Hub61.6%
83.9% of the best (73.4%)
55th percentile of 21
high · reasoning level: High
Source: Epoch AI — AI Benchmarking Hub1,587
23% expected win rate against the board leader (1,797)
85th percentile of 86
high · board 2026-09-05
Source: Arena (LMArena) — Leaderboard Dataset97.2%
97.2% of the best (100.0%)
81th percentile of 78 · n = 45
high
Source: Epoch AI — AI Benchmarking Hub71.6%
76.4% of the best (93.7%)
75th percentile of 61 · n = 290
high
Source: Epoch AI — AI Benchmarking Hub36.6%
37.5% of the best (97.6%)
68th percentile of 51 · n = 48
high
Source: Epoch AI — AI Benchmarking Hub58.0%
58.0% of the best (100.0%)
82th percentile of 61
1,491
48% expected win rate against the board leader (1,507)
91th percentile of 92
high · board 2026-09-02
Source: Arena (LMArena) — Leaderboard DatasetNearby on the leaderboard

28 of the models on this page run inside Theo today. Theo picks the right one for each step and always shows which engine answered.