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Sphinx vs Together AI

Sphinx logo

Sphinx

Documentation

Documentation generator built for large technical projects

From
Free
Rated
-
Full reviewWebsite
Together AI logo

Together AI

AI

Open-source AI at scale

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Sphinx reStructuredText is harder to write than Markdown and puts off contributors, though MyST now allows Markdown; Together AI free tier limits not clearly specified in pricing documentation
  • They diverge on capability: Sphinx covers Cross-references, Together AI covers Open-source models.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Sphinx and Together AI actually diverge.

Attributes where Sphinx and Together AI differ
AttributeSphinxTogether AI
Pricing modelOpen source, no licence feeusage-based
PlatformsLinux, macOS, WindowsApi, Cloud
CategoryDocumentationAI
FoundedUnknown2022

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Sphinx

  • Cross-references
  • API autodoc
  • Multi-format output
  • Extension ecosystem

Only in Together AI

  • Open-source models
  • Fine-tuning
  • Fast inference
  • Embeddings
  • REST API
  • Python SDK
  • OpenAI compatible
  • Api support

What people use each for

The jobs each tool is most often brought in to do.

Sphinx

  • Large technical documentation needing reliable cross-referencesnot Together AI
  • Python projects generating API docs from docstringsnot Together AI
  • Documentation that must ship as PDF as well as HTMLnot Together AI

Together AI

  • LLM inference for production AI applicationsnot Sphinx
  • Content generation at scalenot Sphinx
  • Code execution and embeddingsnot Sphinx
  • Model fine-tuning and trainingnot Sphinx
  • Startup and enterprise AI deploymentnot Sphinx

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Sphinx

  • reStructuredText is harder to write than Markdown and puts off contributors, though MyST now allows Markdown
  • Configuration is complex and the default output is dated-looking without theme work
  • Build times on large documentation sets are slow
  • Heavier than the problem for a small project that only needs a few pages

Together AI

  • Free tier limits not clearly specified in pricing documentation
  • Pricing varies significantly by model and use case
  • Requires account setup for production access
  • Batch API discounts apply only to non-urgent workloads

Pricing, plan by plan

Sphinx

Free
  • SphinxFree
    • Full functionality
    • Commercial use permitted
    • Community support

Together AI

Free
  • Serverless Inference$0.03/1M input tokens
    • Chat and Vision models
    • Image generation
    • Video generation
  • Provisioned Throughput$21600/month
    • Up to 83% savings vs commercial alternatives
    • Reserved capacity
    • Guaranteed throughput
  • Dedicated Inference$5.49/hour
    • H100 GPU instance
    • Single-tenant deployment
    • No resource sharing
  • GPU Clusters$3.99/GPU-hour
    • On-demand capacity
    • Volume discounts available
    • Reserved options with up to 35% savings

Which should you pick?

Choose Sphinx if

  • You need cross-references.
  • You want to start without paying.
  • You work on Linux, macOS, Windows.
  • You also want api autodoc.
Sphinx review

Choose Together AI if

  • You need open-source models.
  • You want to start without paying.
  • You work on Api, Cloud.
  • You also want fine-tuning.
Together AI review

Questions people ask

Is Sphinx or Together AI better?
Neither clearly leads. Sphinx starts at Free and Together AI at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Sphinx or Together AI?
Sphinx starts at Free and Together AI at Free.
Does Sphinx or Together AI run on more platforms?
Sphinx runs on Linux, macOS, Windows. Together AI runs on Api, Cloud.
Can I use Sphinx for free?
Both have a free tier, so you can try either at no cost before committing.
What is Sphinx best used for?
Sphinx is most often used for large technical documentation needing reliable cross-references, python projects generating api docs from docstrings, documentation that must ship as pdf as well as html. Of those, large technical documentation needing reliable cross-references and python projects generating api docs from docstrings are not what Together AI is typically brought in for.
What can Sphinx do that Together AI cannot?
Sphinx covers Cross-references, API autodoc, Multi-format output, Extension ecosystem. Together AI covers Open-source models, Fine-tuning, Fast inference, Embeddings.

Answered from the vendors’ own pages

Sphinx: Is Sphinx free?

Yes, open source under the BSD licence.

Together AI: Does Together AI offer a free tier?

Yes, Together AI advertises 'Start for free, scale on demand,' but specific free tier usage limits are not detailed on the pricing page.

Source
Sphinx: Do I have to write reStructuredText?

Not any more. The MyST extension allows Markdown, though reStructuredText remains the native format and most examples use it.

Together AI: What are Together AI's highest model prices?

Serverless inference pricing ranges from free for base models up to $4.40 per 1M input tokens for premium models. Video generation costs $0.14 to $3.20 per video depending on resolution.

Source
Sphinx: Why do large projects choose Sphinx?

Automatic cross-referencing and API extraction from docstrings, which lighter generators do not provide.

Together AI: How much can I save with Provisioned Throughput?

Together AI offers up to 83% savings compared to commercial alternatives when using their Provisioned Throughput option with reserved capacity.

Source
Together AI: What is Together AI's fine-tuning pricing?

Standard fine-tuning costs $0.48 to $2.90 per 1M tokens depending on model size, with a minimum charge of $4.00 per job.

Source
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