Together AI vs Langfuse
A detailed comparison to help you choose between Together AI and Langfuse.
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Verdict: Langfuse wins
Langfuse scores 4.3/5, edging out Together AI at 4.1/5. Engineering teams running LLM apps or agents in production who want framework-agnostic tracing and evaluation with either a cheap managed cloud or a free self-hosted stack.
Together AI Run open-source AI models in the cloud | Langfuse Open-source LLM observability and evaluation | |
|---|---|---|
| Rating | 4.1 (1 review) | 4.3 (1 review) |
| Pricing Model | usage-based | freemium |
| Starting Price | Pricing varies | Free tier available |
| Best For | Developers and researchers who want to run, compare and fine-tune open-weight models across a wide catalogue with OpenAI-compatible calls and no minimum spend. | Engineering teams running LLM apps or agents in production who want framework-agnostic tracing and evaluation with either a cheap managed cloud or a free self-hosted stack. |
| Free Tier | ||
| API Access | ||
| Team Features | ||
| Open Source | ||
| Tags | api accessfree tieropen source | free tieropen sourceapi access |
| Visit Together AI → | Visit Langfuse → |
Together AI
Pros
- + Switched one pipeline across four serverless models in an afternoon — only the base URL and model string changed
- + Model table publishes context length, cached pricing and quantisation format (NVFP4/FP8/MXFP4) per model
- + Flash-tier pricing ($0.15-$0.30 input) made a 10M-token/day extraction job far cheaper than frontier equivalents
- + Breadth: chat, image, vision, video, audio, embedding, rerank and moderation under one API
- + $800M raise at $8.3B valuation (July 2026) is a strong continuity signal for an infrastructure vendor
Cons
- - No proprietary frontier models; my messy scanned-forms task needed a frontier fallback
- - No published per-model latency figures — you must measure for yourself
- - Fine-tuning pricing (tokens x epochs, per-model rates) takes real digging to budget
- - Experimental and free-tier models sit in the same list as production ones with no quality signal
- - Dedicated GPU cluster options exist but are not as configurable as pure compute providers
Langfuse
Pros
- + MIT-licensed core with free, unrestricted self-hosting — only named enterprise features like audit logs and SCIM need a licence key
- + A 5-seat team at 100k traces runs roughly $69/month versus about $420/month for the main closed alternative (Panoply's independent estimate, consistent with my bills)
- + OpenTelemetry-native tracing across OpenAI SDK, LangChain, LlamaIndex, Pydantic AI, Vercel AI SDK, CrewAI and raw OTLP
- + Graduated usage pricing is transparent and cheap: worked examples on the pricing page match my own invoices (200k units on Core = $37/month)
- + Dataset-backed evaluation with the langfuse/experiment-action GitHub step let me gate prompt changes in CI on a real test set
Cons
- - v3 self-hosting needs Postgres, ClickHouse, Redis and S3 where v2 ran on one container — a four-service system to operate
- - Heavy agent traces render slowly in the UI (issue threads #10391 and #9933 match the multi-second loads I measured)
- - Online evaluations score a sample of traffic rather than everything, so rare failure modes can go unscored
- - UI-configured evaluators cannot be triggered programmatically for scheduled pipelines in my setup
- - Owned by ClickHouse, Inc. since January 2026 — licence unchanged so far, but the vendor-independence profile shifted
Frequently Asked Questions
Which is better, Together AI or Langfuse?▼
Langfuse scores higher at 4.3/5 vs 4.1/5 for Together AI, making it the better-rated option in our comparison.
What is the difference between Together AI and Langfuse?▼
Together AI: Together AI is a cloud platform for running, fine-tuning and serving open-source AI models, including dedicated GPU clusters. Langfuse: Langfuse is open-source observability for LLM applications, tracing calls, running evaluations and tracking cost and latency in production.
Is Together AI or Langfuse more affordable?▼
Together AI starts at €0/mo, Langfuse starts at €0/mo. Check the comparison table above for current pricing.
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