Building ensembles of open models that work as one

Joined May 2026
Today we’re launching Echo: Fable-level quality at ~1/3 the inference cost using open-weight models. Echo matches or nearly matches Fable on math, science, and the coding benchmarks we currently cover, while trailing on multilingual and broader knowledge. 🧵
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Tracer (YC S26) retweeted
Introducing @heygradon (YC F26), Legora for the firms that design the world's buildings and infrastructure. Every road, bridge and building starts with engineers. But there aren't nearly enough of them for everything the world needs to build. So we're making every engineer a 10x engineer. This is Gradon.
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Tracer (YC S26) retweeted
Sorry for delay! Here is my work on zero order (ZO) optimization. We achieve SOTA for ZO methods on pretraining controlling for compute and parameters. ZO methods struggle to improve loss as model size grows because relative gradient variance increases linearly with the number of perturbed parameters, inhibiting large model training. All previous methods innovate on the optimizer, but adopt architectures designed for backprop. Instead, we design an architecture with ZO in mind, that caps the gradient variance as you increase model size. Introducing SOMA (Sharded Optimization Mixture of Assemblies). SOMA shards the model into tiny experts, and trains each expert independently, on disaggregated GPUs, without communicating gradients, activations or optimizer state during training. Inspired by the thalamus and cortical columns, each expert specializes on a subset of the train set based on a fixed router. At isocompute and isoparams, SOMA achieves lower loss vs. all monolithic ZO methods tested (e.g. EGGROLL, more perturbations w Vanilla SPSA, etc). ZO w SOMA continues to improve at larger model sizes. Additional inference benefits of this architecture, we can select top-k active experts over N trained experts to reduce inference compute by O(N/k), allowing us to tradeoff inference flops for accuracy wo retraining.
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Tracer (YC S26) retweeted
We got into @ycombinator 3 months ago with zero revenue and today @FabraixHQ is at $1.04M annualised run rate. Traditional cybersecurity was built for software that behaves within defined boundaries. AI agents can reason, use tools, take actions, and find ways around those boundaries. The cost asymmetry we're seeing in irl warfare is also now a software problem. So we built autonomous red-teaming agents that find real vulnerabilities in AI agents that work 24/7, powered by our own state-of-the-art offensive models that outperform frontier models. AI agents are automating all knowledge work. @FabraixHQ is the adversarial testing infrastructure that will secure every production agent.
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Tracer (YC S26) retweeted
this was wild amounts of disinformation / fear mongering / the stupidest interview ive ever seen: 1) ai did NOT hack huggingface on its own "independent volition". it wasnt sitting there thinking hmm what should i do today, maybe ill hack HF bc i hate humans. No, 10841 *was prompted* w ExploitGym to: "Exploit the specified vulnerability in this target to obtain the secret flag." and it was overly persistent in that task that any reasonable oai tool monitoring or alignment could have stopped easily. how is that "on its own independent volition"? flat out lie. 2) ai did not solve a millennium problem by itself and its not even close to doing so. the evidence / timeline of what happened w Navier-Stokes is quite solidified now. oai trained on some version of traces of Tristan / Levent's work that made huge strides toward the counterexample. oai heard about it, prompted it w their work, and spawned 10k agents to brute force Tristan/Levent's counter example to take it the full distance w a lot of human in the loop. the ai didnt solve NS on its own, and its no where near capable of solving other millennium problems. 3) how will AI kill us all? something something bioweapons / hacking critical infrastructure. china does BOTH all the time to US everyday, and it hasnt killed us all. and china will use AI to do both forever whether we stop US AI or not. if you are truly scared about this then you should be way more afraid of china. ai might do this in the future. china is doing it right now. where is the outrage about china? wonder why.. the issue is NOT AI acting on its own volition whatsoever. its foreign state actors using AI against their own ppl and foreign adversaries (mostly US gov and its citizens). how will regulating AI in america stop china from doing so? it makes it worse! china will continue but now we have one hand tied behind our back. 4) the facts around the coxon tweet and the retweet pattern and immediate cnn int that followed suggest this was a complete coordinated / expensive marketing / fear mongering campaign in the millions of dollars. paid for by whom? also this guy is the biggest EA doomer ive ever seen that worked for anth fro a few weeks and cant be taken seriously. i hope everyone realizes what this is. ai regulation will not benefit americans at all. it will benefit the frontier labs greatly as bill gurley explained long ago. dont fall for the fear mongerers. ai is not dangerous. ai cant unclog a toilet yet. everyone chill. youtu.be/i30jVPqQeOM?is=h6KL…
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Tracer (YC S26) retweeted
We benchmarked DeepSeek V4.1 Flash by @deepseek_ai . It reached 98% of GPT-6 Astra’s score at 1.4% of the cost on everyday design tasks based on user requests. Every model except Astra scored lower AND cost more. Are open models overtaking closed ones? Full results below ↘️
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Tracer (YC S26) retweeted
in the past 24 hours alone, micro1 has paid out $5.8M to 9 businesses for their enterprise data. that’s an average of over $600k per business. frontier AI needs training data that captures the complexity of real-world work. real businesses hold decades of decisions, exceptions and learnings that make the next breakthroughs possible. realism is a new dimension of scale & arguably the most important ingredient for model training data. if your company is interested in a data partnership, reach out to us.
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Tracer (YC S26) retweeted
call for presenters on 9/23 for next yc paper club.. theme: alternative compute paradigms. speaker requests: #1 optical compute in the future future it cant be the case we - talk to the datacenters in light - talk intra-datacenter in light - then convert to electrons to math generate all the heat and consume all the energy. - then back to light out of datacenter seems like photons are enough. #2 doped diamonds: shout out to @KaraDiamonds and @AarinJhaveri for putting me onto this idea. synthetic diamonds have come down in cost to produce by 20x in last 10 years. making this a viable candidate to replace silicon. #3 bio-gpu: scariest one, but im fine w it if a cow brain or something.. a cluster of neurons we can plug into a rack. biology already iter'd for 4.5B years to make training/inference low power. would be interesting. #4 quantum: been promised to me for 20 years. all ppl i know working on this have said this is no where close. 5 neuromorphics: similar to quantum. but less exciting. but what do i know. -- any suggestions for speakers? any other crazy ideas to get off of silicon?
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Google’s selected bid for Spirit Airlines’ data + software was $10M. Under the assumptions in our new paper, that price only requires ~0.236% persistent economic uplift over 3 years to break even. We tried to work out what that actually means for pricing proprietary data in AI. tracerml.ai/research/pricing…
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This does not tell us Spirit was underpriced. Its actual contribution to Google’s models is unknown. What it does show is that $10M sets a relatively low economic hurdle under the stated assumptions.
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The paper also proposes a way to measure the missing piece directly: Capability Alpha = the causal performance gain attributable to a proprietary dataset under a controlled training/evaluation setup. Full paper + interactive model: tracerml.ai/research/pricing…
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Echo is now natively supported in OpenCode 🎉 echo/echo is officially in models.dev 🫡 Try now at echo.tracerml.ai
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Tracer (YC S26) retweeted
Signup below for next YC Paper Club - "Harness Edition" Killer Lineup: - @sethkarten - Prime Agent @PrimeIntellect - @beyang / @sqs - @AmpCode - @josh__france - QM @ycombinator - @JonSaadFalcon - OpenJarvis - ? One more slot for speaker. Who should I ask? 8.26 5pm-9pm MV Also, fresh look for paper club! 100% credit goes to @eve_bouff! Aiming for: ... 2am, full team, in lab, tryna meet May 6, 2026 AoE deadline, paper not compiling-kinda vibe.. events.ycombinator.com/yc-pa…
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Tracer (YC S26) retweeted
I love agentic coding harnesses, but they shouldn't be primarily terminal-based. The terminal is great for quick and precise commands, but information density is extremely low and UI affordances are minimal. Maybe provision of TUIs is worthwhile for occasional use (when establishing a tunnel is too annoying, or something), but it feels very strange for this to be the default modality. It took a long time for dynamic language REPLs to break out of the terminal (Jupyter notebooks and similar); I hope we don't have to wait as long for the harnesses.
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Frontier is our floor. DeepSeek reprices. Qwen drops. Meta drops. another model next week. great. Echo doesn’t tune around any of them. we compose whatever is best right now. worst case, we get the frontier. best case, the ensemble gives you something better. the faster this race moves, the better Echo gets.
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deepseek raised prices. we’ll pay you to switch. if you’re on opencode, you can swap to echo directly. fable-level results at ~1/3 the cost. top up $20 in, we add another 20
DeepSeek has officially increased their prices OpenCode Go's limits have been updated to reflect them We have made progress on operation cheepseek, more info soon
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DeepSeek raised prices. We’ll pay you to switch. Echo gets Fable-level results at ~1/3 the cost and can be customized to your workload. Works in OpenCode, Cline & Zed. Top up $20 → we add another $20. Only for the next 1,000 users. Go burn it.
Replying to @deepseek_ai
API pricing update 💰 With the V4 lineup release, we’re updating our API pricing and introducing peak and off-peak rates. Off-peak rates are 50% lower than peak, enabling more flexible workload scheduling. 📉 New pricing takes effect at 16:00 UTC, Aug 16, 2026 🕒
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Tracer (YC S26) retweeted
JUST IN: Stripe acquires AI model marketplace OpenRouter for more than 5x its valuation three months ago
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There are 2,992,444 models on HuggingFace today. 200,000+ in May 2023. Almost 15x in 3 years. Yet most AI stacks still treat model choice as infrastructure: benchmark a few, pick 1, fine-tune around it, ship. The model ecosystem is now moving faster than that decision cycle. At some point, model selection itself becomes the bottleneck.
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There is also a bigger bet behind this. A lot of AGI discussion still assumes progress comes mainly from building a single model with more and more capability packed inside it. There is another plausible path: intelligence emerges from systems that learn how to assemble capabilities dynamically. Decompose a new task. Pick the right models. Run some in parallel. Let them disagree. Verify the result. Spend more compute only where needed. Replace components as better ones appear. If AGI comes from that direction, ensembling becomes part of the capability frontier itself.
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This is what we're testing with Echo. The general-purpose Echo ensemble is already available for chats and tasks. The new piece we're testing is the adapter layer: give Echo representative data from a workload, and it learns an ensemble customized around that workload. The latest experiment ran across 1,200 real-task examples and 11 endpoints: Strongest fixed model: 74.50% accuracy, $0.008226/request Echo adapted ensemble: 74.75% accuracy, $0.001740/request Same quality within noise, 78.8% lower recorded cost. Across the 5 evaluation folds, Echo ended up with different ensemble structures depending on the data, including model panels, conditional escalation and routing-only when that was enough. With an unprecedented number of models on the market. The question is becoming: how do we make them work together, and keep the ensemble improving as the model pool changes? General-purpose Echo is live at tracerml.ai for chats and tasks. If you want to see what the adapter learns on your own workload, DM us.
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