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Fireworks AI on August 31, 2026 announced the general availability of its Training API and Fireworks Lab, opening its managed training and rollout infrastructure to ML teams that want to run custom training loops on open models. The Training API connects a customer's own Python training loop to Fireworks-managed distributed compute, covering both the trainer that computes gradients and updates the model and the rollout deployment that generates samples from it. Under the arrangement described…