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Thinking Machines Lab

Inkling

Released Jul 15, 2026 · knowledge cutoff 2026-04

Status
Superseded
Location
United States
Type
LLM
Modality
Multimodal
Context window
1M
Max output
—
Speed (xhigh effort)
84 tok/s · 2.57s to first answer token
Price ($/MTok in / out)
$1.87 / $4.68
Cost per task
—
Open weights
Yes
Benchmarks9 of 10 reported

GPQA Diamond

87.2%

SWE-bench Verified

77.6%

SWE-bench Pro

54.3%

Terminal-Bench 2.1

63.8%

AIME (latest)retired

97.1%

Humanity's Last Exam

29.7%

LMArena Elo

1441

GDPval-AA v2

1238

ARC-AGI-2

36.5%

MMLU-Proretired

—
Strengths & weaknesses

Strengths

  • Built to be fine-tuned — same-day tuning support and an unrestricted licence
  • Takes images and long audio natively, still unusual for an open-weights model
  • Open at frontier scale from a US lab, with no regional restrictions

Weaknesses

  • Weak factuality — it hallucinates at a high rate and needs grounding for anything factual
  • Degrades in long multi-turn conversations
  • Positioned as a base to customise, not a model to deploy as it ships

Thinking Machines Lab's first production model, released 2026-07-15. All benchmarks are the lab's own model-card figures at effort=0.99; HLE is 29.7% text-only / 46.0% with tools, and the model card reports Global-MMLU-Lite 88.7% rather than MMLU-Pro, so MMLU-Pro, LMArena Elo and ARC-AGI-2 are left null. Pricing is Tinker's 64K-context tier under a limited-time 50% discount ($1.87/$4.68 per MTok, $0.374 cached); the 256K tier is $3.74/$9.36, and OpenRouter hosts list about $1.00/$4.05. Context is 1M with the open weights but capped at 256K on the Tinker API; no max output figure is published. Also reported: SWE-Bench Pro Public 54.3%, Terminal-Bench 2.1 63.8%, GDPval-AA v2 Elo 1238, MMMU Pro 73.5%. ARC-AGI-2 36.5% (and ARC-AGI-1 79.5%) and LMArena Elo 1441 were added later, from the Inkling-Small comparison table and the LMArena text leaderboard respectively. Knowledge cutoff April 2026 per Thinking Machines' Inkling model card, read via search excerpt only.

For developers

API model strings

  • thinking-machinesthinkingmachines/Inkling

Licence

Apache License 2.0 · Permissive · commercial use permitted

Retirement

No retirement announced

Lineage

No recorded predecessor

News