Observed Signal · Feb 17, 2026 · Funding · Source: Storytelling Edge · Impact: 3/5 · Sentiment: Positive
Goodfire raises $150M to decode AI 'alien brains'
Goodfire, an AI research startup focused on mechanistic interpretability, has raised a $150 million Series B at a $1.25 billion valuation. Co-founded by Dan Balsam (co-founder & CTO), Eric Ho, and Tom McGrath, the company builds tools to inspect and intervene at neuron-level representations inside large models. Goodfire says its work has produced practical outcomes: identifying potential epigenetic biomarkers for earlier Alzheimer’s detection with partner Primmamenta, deploying inference-time interpretability guardrails with partners like Rakuten, and detecting neuronal "hallucination signatures" that can be used as training signals to reduce hallucinations. The interview discloses the host Joe Lazer is a small seed investor in Goodfire and places the company’s approach as a safety- and reliability-focused complement to mainstream LLM scaling efforts.
Goodfire’s large Series B and reported interpretability breakthroughs (hallucination signatures, neuron-level interventions, and a potential Alzheimer’s biomarker) could materially advance model reliability, safety, and trustworthy deployment—issues relevant to AI productization and downstream industries.
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Key Takeaways & Evidence Grounding
- Goodfire raised $150 million in a Series B round at a $1.25 billion valuation.
- Goodfire was co-founded by Dan Balsam (co-founder & CTO), Eric Ho, and Tom McGrath.
- Goodfire focuses on mechanistic interpretability—examining neurons and connections inside large models and intervening at neuron-level.
- Working with partner Primmamenta, Goodfire reported extracting a candidate epigenetic biomarker for earlier Alzheimer’s detection and building a proxy model reproducing much of the performance.
- Goodfire reported identifying neuronal "hallucination signatures" and using those signals to train models to substantially reduce hallucinations.
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Goodfire Launches Internal AI Agent Monitors
Goodfire, a startup specializing in AI interpretability, launched on Thursday a new type of AI agent monitor that inspects a model's internal signals rather than reading its output, aiming to detect rogue behaviors more efficiently and at a fraction of the cost. The monitors are available to customers of Baseten, an AI model hosting platform. Baseten's Base Labs had previously announced a safety partnership with Goodfire and Hugging Face. Goodfire's approach uses small probes that scan a model's internal activations at each step, triggering a closer AI review only when flagged. In tests on the Kimi K3 model, Goodfire's monitors caught 94% of malicious hacking sessions and cost about $51 for 1,500 sessions, compared to $233 for a cheaper model and $10,000 for a top-tier one. The company positions the solution for open models, which can be stripped of safeguards, and sees it as critical for inference-time guardrails.
Goodfire unveils Silico to debug LLM neurons
San Francisco startup Goodfire has introduced Silico, a new tool designed to let researchers and engineers inspect and intervene in Large Language Models during all phases of development — from dataset construction to training. Silico is built around the approach known as "mechanistic interpretability," an effort also pursued by organizations such as OpenAI, Google Deepmind and Anthropic to make LLM behavior more understandable and controllable. Goodfire says Silico enables parameter-level inspection and adjustment inside models, which the company argues provides a scientific (rather than purely scale-driven) path to controlling undesirable behaviors. The article was published on May 12, 2026 and written by Will Douglas Heaven for MIT Technology Review (republished on t3n).
Goodfire unveils Silico to debug LLMs
San Francisco startup Goodfire has introduced Silico, a new tool designed to let researchers and engineers inspect and intervene in large language models during development and training. Silico reportedly enables viewing and adjusting model parameters across the development pipeline — from dataset construction to model training — aiming to make LLM behaviour more explainable and controllable. Goodfire frames the approach around "mechanistic interpretability," a research direction also pursued by labs such as OpenAI, Google DeepMind and Anthropic. Eric Ho, Goodfire’s CEO, described the product in an exclusive interview with the US edition of MIT Technology Review. The article was published 2026-05-08 by Will Douglas Heaven.
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