I tink, therefore I am Post-training API by @thinkymachines
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Joined January 2026
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Inkling is our first open model from @thinkymachines and is now available on Tinker! Check out these quotes from Tinker customers on their experience with Inkling:
@_Mantic_AI: "Not only does Inkling outperform Kimi K2.6 on our forecasting evals, it does so with half the output tokens."
@trajectorylabs: "We’ve been impressed by how sharp and efficient the model is. Its reasoning is concise, its tool calling is consistently strong, and it holds up well on complex, long-horizon agentic tasks. It feels like a meaningful unlock for what teams can build with open-source models designed for customization."
@lightningrodai: "We came away impressed by the model’s underlying reasoning ability. It’s thoughtful, original, and refreshingly unsycophantic.”
Today, we are introducing Inkling.
Inkling reasons efficiently across text, image, and audio modalities. We are making the full weights available.
thinkingmachines.ai/news/int…
Available today for fine-tuning on Tinker. Play with it in the Inkling Playground. 🧵
Off-policy RL is difficult; runs can suddenly collapse because of async RL staleness or numerical mismatch.
StableReinforce is a new method on Tinker that keeps your RL runs stable, even when learning drifts from sampling.
tinker-docs.thinkingmachines…
Agents are good at navigating filesystems. With RL, they learn to build new ones in anticipation of other agents' queries, boosting subsequent RAG accuracy from 44% to 77%.
A step towards agents training to work together, supported by the Tinker grants program!
now live on Tinker!
🚀 DeepSeek-V4.1-Flash-1017 is here!
Stronger benchmark performance, faster task completion, and shorter outputs than the previous version—a Pareto improvement in performance and cost. Now live on our website, app, and API.
🛠️ Optimized for @DeepSeekHarness, Tencent CodeBuddy, WorkBuddy, and more. Upgrade to DeepSeek Harness v0.2.1-rc.1 or later for the best experience with the new model.
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We're hiring a Tinkerer who's excited to read post-training research, build it in Tinker, and share the results with everyone
Tinker runs on open science, and we want you to make it a home for the researcher community
jobs.ashbyhq.com/ThinkingMac…
Tinker retweeted
Tinker lets customers turn their expertise into cutting-edge models that they own. One year after launch, we look back at what we’ve shipped and what our users are building.
thinkingmachines.ai/news/one…
Nemotron 3.5 Super VL from @nvidia is live on Tinker today.
With 12B active parameters, efficient architecture, and native text, images, and video inputs 3.5 Super VL should be a strong base for training long running always-on multimodal agents.
Dimuon is a new optimizer we built for LoRA fine-tuning. In our SFT tests, it often reaches lower loss in fewer steps than AdamW. We're still experimenting with Dimuon; you can Tinker with it today and share your feedback!
See our optimizers guide at tinker-docs.thinkingmachines…
Tinker retweeted
Thinky is my go to for this thinkingmachines.ai/tinker/
GLM-5.3-Flash and DeepSeek-v4.1-Flash join the Tinker lineup today. Both models natively take image inputs and utilize efficient attention architecture. GLM-5.3-Flash is 4-5 times cheaper on Tinker than GLM-5.3!
Also live: long-context options for Qwen3.5-4B and Qwen3.6-35B-A3B.
By changing the prose but keeping the arguments and labels, IdeaLens detects where a person or AI came up with the idea, not just who wrote them down. Trained on Tinker, and the code+data+model are open sourced as well!
Traditional AI detectors are accurate when ideas and prose come from the same source. However, on mixed provenance benchmarks where they differ, they follow the prose and not the ideas in the writing.
IdeaLens correctly detects who came up with the ideas and not who wrote the prose on these mixed benchmarks, with an average idea detection accuracy of 81.3% vs ProseLens's 25.4% and Pangram 4's 25.9%.
This suggests that ideas are a strong differentiator of human and AI writing.
Fulcrum's training approach is brilliant: the base model already knows how to write, so both SFT and RL are tailored to the precise distinction between the default LLM voice and authors' voices. Smart customization can be both cheap and effective.
Say hello to Echo, the best writing model at style imitation. Echo beats frontier models at writing tasks ranging from fiction to technical explanations, despite costing less than $5K to train.
LLM next-token prediction is already a probabilistic classifier, so an open LLM can serve a Jev-like interface: discrete options in, fast probabilities out. Our own @ekzhang1 made it better at the job with a $5, 10-minute run on Tinker.
Did some SFT on Qwen3.6-35B-A3B this evening, just to get it to respond better to Jev-y prompts via github.com/ekzhang/openjev-s…
Cost: $5, easy 10 min training run on Tinker. +8% on GPQA diamond and +12% on MMLU-Pro.
Also evaled @jaredpalmer's Kev here for comparison
... and now you can too. Our new cookbook recipe let's you train your own decision model, targeting either a single answer or a calibrated probability distribution. It matches our reasoning RL recipe on forecasting, while requiring no reasoning at all!
tinker-docs.thinkingmachines…
Training a search agent is great for RL because every lever impact model behavior in legible ways. Jasper's guide shows how small updates to the reward function teach a model to avoid sloppy tool calls, prune unnecessary docs, and balance persistence with token efficiency.
Sharing my first of hopefully many research blog posts! jasperlu.com/blog/training-s…
This one is the kind of educational blog post I wish I'd had when I started with RL for LLMs.
I tried to make it as open as possible. Every rollout is browsable, the code is open source, and I walk through my entire thought process, from learning rate sweeps to reward shaping.
Sundial put the effort in getting RLVR right: training on verified fixes instead of artificial errors, smart rewards that disincentivize hacking, and deterministic scoring.
The result — a trained Inkling-Small that fixes 83.7% of LaTeX errors in under 1 second and $.0013.
We fine-tuned @thinkymachines' Inkling-Small to fix LaTeX compile errors inside the editor, in under a second. On real errors it matches Claude Fable 5.1, six times faster and at about 1/40 of the cost.
When we interviewed mathematicians, one of the most common annoyances we heard about in their day to day work is battling with LaTeX compilation errors.
The most obvious solution is to ask a chatbot to fix errors. That works decently well, except switching to a different window breaks the writing flow, and copy-pasting the snippet often loses relevant context, especially when multiple files are involved.
So we scraped 272,000 questions from TeX.StackExchange and kept the 3,978 whose snippet still fails today, whose accepted answer compiles, and whose difference replays exactly as a patch. The largest dataset previously released had 88.
We tried tweaking the reward function in many ways. The first one was only a compilation check, which led the model to remove content until the document built. In the end, what worked best was rewarding compilation and a close match with the solution's PDF, and penalizing removed content.
We're rolling out the model inside the @sundialmd editor this week. When a compile fails, the fix is applied as a suggestion in under a second and the PDF rebuilt.
Write-up: sundial.md/blog/textinguishe…
Thanks @tinkerapi and @thinkymachines for the support.
