Inkling-Small
Released Jul 30, 2026 · knowledge cutoff unpublished
- Status
- Superseded
- Location
- United States
- Modality
- Multimodal
- Context window
- 1M
- Max output
- —
- Speed
- —
- Price ($/MTok in / out)
- $0.50 / $1.20
- Cost per task
- $0.073
- Open weights
- Yes
Benchmarks7 of 8 reported
GPQA Diamond
SWE-bench Verified
Terminal-Bench 2.1
AIME (latest)
Humanity's Last Exam
LMArena Elo
ARC-AGI-2
MMLU-Pro
Strengths & weaknesses
Strengths
- Thinking effort sweeps from minimal to xhigh, and the whole performance curve sits above its much larger sibling's
- Reads audio and images through the same encoder-free stack, and will drive Python to crop and zoom into a chart it cannot read directly
- Overtook the full-size Inkling on reasoning and agentic coding after two extra weeks of RL on a distilled checkpoint
- Runs cleanly across third-party coding and agent harnesses, not just its own
Weaknesses
- Factually thin — it covers less ground than Inkling and still needs retrieval and human review for anything consequential
- Degrades in long multi-turn conversations, and the model card concedes it sometimes ignores instructions outright
- Multi-step tool use went backwards versus Inkling even as the reasoning scores went up
Thinking Machines Lab's second release, a 276B/12B MoE trained on GB300 systems. All benchmarks are the lab's own model-card figures at effort 0.99; SWE-bench Verified uses a bash-only harness and Terminal-Bench 2.1 an internal one with web-contaminated solutions scored zero. HLE 31.6% is text-only no tools / 47.8% with tools. MMLU-Pro is not reported (Global-MMLU-Lite 86.7% instead). Also reported: SWE-bench Pro public 55.9%, GDPval-AA v2 Elo 1269, MMMU Pro 74.0%, IFBench 82.2%, ARC-AGI-1 84.0%. Context is 1M with the open weights but OpenRouter serves 512K; Thinking Machines publishes only the $1.20 output price, and $0.50 input is the OpenRouter listing (Artificial Analysis lists $0.30). LMArena Elo 1431 is an AutoEval rating.
For developers
API model strings
Not researched
Licence
Not researched
Retirement
No retirement announced
Lineage
No recorded predecessor