← STARTUPSAI INFRASTRUCTURE · BASELINE 2026-04-20

Together AI

confidence: high · 3 watch questions · 5 evidence citations

01 TEAM & SIZE

Founded 2022. Co-founders: Vipul Ved Prakash (CEO, ex-Topsy → Apple), Ce Zhang (CTO), Tri Dao (Chief Scientist, FlashAttention / Mamba co-author), Chris Ré (Stanford), Percy Liang (Stanford). Leadership: Charles Zedlewski (CPO), Albert Meixner (SVP Eng), Mahadev Konar (SVP Eng Infra). Headcount: Tracxn ~355 (Mar 2026); PitchBook ~335; getlatka 2024 listed 287. Stanford research DNA + production systems team. [S-6-002, S-6-004]

02 FUNDING & STAGE

Total raised ~$534M / 4 rounds (Crunchbase). Latest: $305M Series B, Feb 20 2025, General Catalyst-led, co-led Prosperity7 — $3.3B post. Prior Series A $102.5M Mar 2024, Salesforce Ventures-led, $1.25B. Earlier backers: Kleiner Perkins, Lux, NEA, a16z, Nvidia, SV Angel, Emad Mostaque. DCD (Sep 2025) reports ~$1B raise at 2x+ the $3.3B — Series C unannounced as of 2026-04-20 (unverified). [S-6-001, S-6-005, S-6-008]

03 PRODUCT STATE

Four surfaces on "AI Acceleration Cloud":

  1. Inference — serverless (pay-per-token, 200+ open models), dedicated model endpoints (up to 43% cheaper on-demand), container inference (media), batch (up to 30B tokens async).
  2. Fine-tuning — managed LoRA / full fine-tune on open weights.
  3. Training / GPU clusters — self-serve Instant GPU Clusters (launched Sep 2025), H100/H200/B200/GB200 NVL72 w/ InfiniBand; B200 $4/hr reserved, $5.50 on-demand; H100 $1.76–$2.39.
  4. Adjacent — Code Sandbox (agent exec), Managed Storage (zero-egress), Together Kernel Collection. Open-source legacy: RedPajama-v1/v2 (>100T tokens, used by Snowflake Arctic, Salesforce XGen, AI2 OLMo), OpenChatKit. [S-6-003, S-6-006]

04 GTM MOTION

PLG bottom-up (450k+ developers per company claims) + enterprise sales for dedicated capacity. Named customers: Salesforce, Zoom, SK Telecom, Washington Post, Cognition (Devin), Hedra, Zomato, Krea, Cartesia. Revenue mix: ~30–40% per-token API, 60–70% GPU rentals. Geo: Hypertec + 5C Group Europe partnership up to 100k GPUs by 2028; live DCs Maryland (Jul 2025), Memphis, Sweden (Sep 2025); ~200 MW N. America. [S-6-004, S-6-007]

05 CORE THESIS

"AI-native cloud" — verticalize the stack (kernels → schedulers → inference runtime → datasets) so open-model inference beats hyperscaler price/perf, and capture enterprises refusing OpenAI lock-in. Bet: open models stay within 6–12mo of frontier; a neutral compute layer with research-grade optimization (FlashAttention lineage) wins the long tail of fine-tunes + agent inference. Distinct from Nous Research (model lab) — Together is the cloud. ARR: $130M end-2024 → $300M annualized Sep 2025. [S-6-004, S-6-007]

06 PUBLIC SIGNALS INVENTORY

Bloghttps://www.together.ai/blog (RSS at /blog/rss unverified)
RSShttps://www.together.ai/blog (RSS at /blog/rss unverified)
GitHubhttps://github.com/togethercomputer (RedPajama-Data, OpenChatKit, flash-attention contribs)
Twitter@togethercompute
LinkedInlinkedin.com/company/togethercomputer
Careerstogether.ai/careers
YouTubeyoutube.com/@togetherai (unverified handle)
PressLatent Space (Prakash + Tri Dao episodes), No Priors, TechCrunch, The Information, Bloomberg

07 52-WEEK QUESTIONS

  1. Q1
    Does the rumored ~$1B Series C close in 2026, and at what valuation multiple of the $3.3B Feb-2025 mark — does it cross $10B?
  2. Q2
    Does per-token API share rise above 50% of revenue (signaling developer PLG winning) or fall below 25% (reservation/cluster-dominant, commoditizing)?
  3. Q3
    Do major Blackwell (GB200) clusters ship on time and show measurable inference $/Mtok advantage vs. AWS Bedrock / Fireworks / Baseten in published benchmarks?

08 WEEKLY TIMELINE

0 signals

TIMELINE EMPTY · WEEK 0

Auto-feed fetcher ships Month 2. Manual diffs via Friday script start Week 2.

09 EVIDENCE

5 items · expand
  1. S-6-001
    Together blog: "$305M Series B" (Feb 20 2025) — explicit round size, lead investors, $3.3B valuation
  2. S-6-004
    SiliconANGLE (Sep 9 2025): Self-service GPU infrastructure launch + ARR figures ($300M annualized)
  3. S-6-003
    Together.ai/products page (fetched 2026-04-20): enumerates 4 product surfaces (inference, fine-tuning, compute/clusters, sandbox/storage)
  4. S-6-006
    GitHub togethercomputer/RedPajama-Data + arXiv 2411.12372 — open-source dataset lineage verified
  5. S-6-008
    DCD (Sep 2025): Together seeking ~$1B round (unverified close)

10 CONFIDENCE & UNKNOWNS

expand

Confidence: high on funding, products, customers, revenue trajectory (multiple independent primary + tier-1 press sources). Medium on exact headcount (355 vs 335 vs 287 across trackers; rapid growth = stale data). Unverified: Series C close date/size/valuation; exact GPU installed base; YouTube handle; RSS URL; GB200 cluster customer count. Nous Research confusion avoided — Together is the compute cloud, not the model lab.

11 RELATED

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