Ornith-1.5-397B
Released Aug 19, 2026 · knowledge cutoff unpublished
- Status
- Unknown
- Location
- United States
- Modality
- Text
- Context window
- 262K
- Max output
- —
- Speed
- —
- Price ($/MTok in / out)
- — / —
- Cost per task
- —
- Open weights
- Yes
Benchmarks2 of 8 reported
SWE-bench Verified
Terminal-Bench 2.1
MMLU-Pro
GPQA Diamond
AIME (latest)
Humanity's Last Exam
LMArena Elo
ARC-AGI-2
Strengths & weaknesses
Strengths
- Trained with an end-to-end self-improvement loop that generates its own tasks, scaffolds and solution rollouts rather than inheriting a human-authored training harness
- Early agentic tests on the family show it planning, building and self-verifying open-ended goals unassisted — including running its own test suite to confirm a fix before stopping
- Ships all three sizes (9B, 35B-A3B, 397B) under a permissive MIT license with no gated weights
Weaknesses
- Launch-week reception is thin and size-dependent — hands-on tests of the smaller 9B sibling exposed a wide gap between published benchmarks and real-world reliability, so the flagship's practical behavior is still largely unverified
- Reported to perform poorly in plain chat without tool access, consistent with a model post-trained specifically for agentic scaffolds rather than general use
- No first-party hosted API at launch — running the 397B checkpoint means self-hosting roughly 800GB (bf16) across multiple GPUs
SWE-bench Verified (86) and Terminal-Bench 2.1 (86.1) are the 397B variant's launch comparisons against Claude Opus 4.8 (85.8 / 85), widely repeated at launch; GPQA Diamond and HLE figures conflict across secondary sources (no consistent primary figure found) and are left null. No official Artificial Analysis measurement or first-party API pricing published as of release. DeepReinforce's Ornith-1.0 (this model's obvious lineage) isn't tracked on this site, so predecessorId is left null rather than pointing at an untracked id.
For developers
API model strings
Not researched
Licence
MIT License · Permissive · commercial use permitted
Retirement
No retirement announced
Lineage
No recorded predecessor