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Each item is one event, written from several sources, with a footnote for every fact.

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Release

StepFun releases Step 5 Preview

In September 2026 StepFun released Step 5 Preview as its new flagship foundation model. It is a sparse MoE with 600 billion total parameters, supports up to 1 million tokens of context, and is offered through the StepFun Open Platform API.

Funding

Stability AI raises a $76 million Series B

On 25 August 2026 Stability AI announced a $76 million Series B whose investors include Sony Music, Universal Music, Warner Music, Electronic Arts and AMD Ventures, taking the funding raised under CEO Prem Akkaraju to about $232 million.