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Together AIOpen-source AI cloud: inference, training, fine-tuning, and GPU clusters for builders standardizing on open-weight models
Annualized Revenue (Feb 2026)
~$1B
up from ~$618M (end-2025); ~3x from mid-2025
Valuation
$3.3B closed / $7.5B in talks
Feb 2025 Series C closed; $7.5B reported in talks (Mar 2026)
Open-Source Model Catalog
200+ models served
Largest catalog of production-ready open-weight model inference in the industry
Co-Founder Pedigree
3 Stanford profs + serial founder
Percy Liang, Chris Re, Ce Zhang (Stanford) + Vipul Ved Prakash (Topsy founder, Apple acquihire)
Total raised: ~$535M · Latest valuation: $3.3B (Feb 2025 closed); ~$7.5B reported in talks (Mar 2026)
| Round | Date | Amount | Valuation | Key Investors |
|---|---|---|---|---|
| Seed | Jun 2022 | $20M | - | Lux Capital (lead)FactorySCB10XMATH Venture Partners+2 more |
| Series A | May 2023 | $102.5M | $500M | Kleiner Perkins (lead)NEAProsperity7Lux Capital+1 more |
| Series A Extension | Nov 2023 | $106M | - | SalesforceCoatueNEA |
| Series B | Mar 2024 | $106M | $1.25B | Salesforce Ventures (lead)CoatueKleiner PerkinsLux Capital+1 more |
| Series C | Feb 2025 | $305M | $3.3B | General Catalyst (lead)Prosperity7Salesforce VenturesNVIDIA+1 more |
| New Round (reported) | Mar 2026 (reported) | ~$1B (in talks) | $7.5B (reported) | Per The Information; round in talks, not closed |
| Product | Type | Status |
|---|---|---|
| Together Inference | High-throughput inference for 200+ open-source models | GA |
| Together Cloud (GPU Clusters) | On-demand H100, H200, B200 clusters with NVLink + InfiniBand | GA |
| Together Fine-tuning | Custom model fine-tuning service on Together infrastructure | GA |
| Together Training | Pre-training service for full open-source models | GA |
| Together Code (DeepCoder-14B) | Open-weight coding model | Released (Apr 2025) |
| RedPajama Dataset | Open-source training corpus | Released (2023) |
Series C investor; Blackwell B200 early-access cloud; Together a core NVIDIA AI Enterprise partner.
Series A, A2, B investor; Together inference powers some Salesforce Einstein Trust Layer model routing.
Series C co-lead; Saudi sovereign-tech thesis.
Generative-AI startups standardizing on Together for inference + training infrastructure.
Compound-AI system reference architectures co-developed with research labs.
Vipul Ved Prakash (Topsy, acquired by Apple), Ce Zhang (Stanford), Chris Re (Stanford), Percy Liang (Stanford) launch Together AI
Together releases the RedPajama open dataset replicating the LLaMA training mix; becomes a foundational open-source corpus
Kleiner Perkins leads $102.5M; Together becomes the canonical open-source AI cloud
Salesforce-led $106M; serves 200+ open-source models in inference catalog
General Catalyst + Prosperity7 (Saudi sovereign) lead $305M; NVIDIA joins as strategic investor
Together releases DeepCoder-14B; one of the strongest open-weight coding models
Together among the first GPU clouds with production-scale B200 deployment
Crosses ~$1B ARR, up from ~$618M at the end of 2025; GPU rentals are the larger share, API ~30-40%
Reportedly in talks to raise ~$1B at a $7.5B valuation, more than 2x the Feb 2025 round
Open-source inference and fine-tuning platform. Hosts Llama, DeepSeek, Mixtral, FLUX, and dozens of other open-weights models with competitive per-token pricing. Series B in 2024 raised $305M at a $3.3B valuation led by General Catalyst. Together AI was founded in 2022, is headquartered in San Francisco, CA and employs ~250.
Together AI has raised ~$535M in total at a $3.3B (Feb 2025 closed); ~$7.5B reported in talks (Mar 2026) valuation, based on the funding rounds Sterling tracks.
Sterling groups Together AI in the AI Software sector, alongside CoreWeave (CRWV), Nebius Group (NBIS), Applied Digital (APLD), IREN (Iris Energy), Fireworks AI (private) and Modal (private).
If you are researching Together AI, also look at CoreWeave (CRWV), Nebius Group (NBIS) and Applied Digital (APLD). You can compare all of them side by side or browse the full AI Software sector on Sterling.
