Softwr

Software · head to head

Comet ML vs OpenAI API

Comet ML logo

Comet ML

Software

Platform for tracking, comparing, and optimizing ML experiments

From
Free
Rated
-
Full reviewWebsite
OpenAI API logo

OpenAI API

Software

GPT and DALL-E APIs for developers

From
$0.15/per-million-tokens
Rated
-
Full reviewWebsite

The short version

  • Only Comet ML has a free tier, so it costs nothing to try first.
  • Each has a real cost: Comet ML the free cloud tier caps data at 25,000 spans a month with 60 day retention; OpenAI API new accounts start with a $100 approved monthly usage limit and must spend cumulatively to graduate tiers
  • They diverge on capability: Comet ML covers Experiment tracking, OpenAI API covers GPT models.

Where they differ

Only the attributes on which Comet ML and OpenAI API actually diverge.

Attributes where Comet ML and OpenAI API differ
AttributeComet MLOpenAI API
Starting priceFree$0.15/per-million-tokens
Pricing modelfreemiumusage-based
Free tierYesNo
PlatformsWeb, Linux, Mac, WindowsApi
Founded20172015

Identical on both: user rating (Not yet rated), category (Unknown).

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 Comet ML

  • Experiment tracking
  • Code versioning
  • Model registry
  • Hyperparameter optimization
  • Production monitoring
  • PyTorch
  • TensorFlow
  • Keras

Only in OpenAI API

  • GPT models
  • DALL-E
  • Whisper
  • Embeddings
  • REST API
  • SDKs
  • Azure OpenAI
  • Api support

What people use each for

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

Comet ML

  • Tracking machine learning experiments, metrics and model versionsnot OpenAI API
  • Monitoring and evaluating LLM applications with tracingnot OpenAI API

OpenAI API

  • Calling hosted language models from an applicationnot Comet ML
  • Generating images, audio and embeddings through one APInot Comet ML
  • Building agents and tool calling workflows on managed modelsnot Comet ML

Where each one falls short

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

Comet ML

  • The free cloud tier caps data at 25,000 spans a month with 60 day retention
  • Retention stays at 60 days even on the paid Pro plan, and extending it is a $29 per 100k spans add on
  • Overage on Pro is $5 per additional 100,000 spans
  • The free MLOps tier is a single user with 100 GB of storage and training hours governed by a fair usage policy
  • Pro MLOps is $19 per user per month and caps the team at 10 users

OpenAI API

  • New accounts start with a $100 approved monthly usage limit and must spend cumulatively to graduate tiers
  • Reaching the top Tier 5 monthly cap of $200,000 requires $1,000 of cumulative paid usage
  • Rate limits apply simultaneously across requests per minute, requests per day, tokens per minute, tokens per day and images per minute, and the first one hit blocks the request
  • API access is restricted to approved geographies

Pricing, plan by plan

Comet ML

Free
  • FreeFree
    • 100 experiments
    • Basic features
    • Community support
  • Team$179/month
    • Unlimited experiments
    • Team collaboration
    • Priority support

OpenAI API

$0.15/per-million-tokens
  • GPT-4o mini$0.15/per-million-input-tokens
    • Fast
    • Affordable
  • GPT-4o$5/per-million-input-tokens
    • Multimodal
    • 128K context

Which should you pick?

Choose Comet ML if

  • You need experiment tracking.
  • You want to start without paying.
  • You work on Web, Linux, Mac, Windows.
  • You also want code versioning.
Comet ML review

Choose OpenAI API if

  • You need gpt models.
  • You work on Api.
  • You also want dall-e.
OpenAI API review

Questions people ask

Is Comet ML or OpenAI API better?
Neither clearly leads. Comet ML starts at Free and OpenAI API at $0.15/per-million-tokens, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Comet ML or OpenAI API?
Comet ML has a free tier; the other does not. Paid plans start at Free for Comet ML and $0.15/per-million-tokens for OpenAI API.
Does Comet ML or OpenAI API run on more platforms?
Comet ML runs on Web, Linux, Mac, Windows. OpenAI API runs on Api.
Can I use Comet ML for free?
Yes. Comet ML has a free tier, so you can try it without paying. OpenAI API starts at $0.15/per-million-tokens.
What is Comet ML best used for?
Comet ML is most often used for tracking machine learning experiments, metrics and model versions, monitoring and evaluating llm applications with tracing. Of those, tracking machine learning experiments, metrics and model versions and monitoring and evaluating llm applications with tracing are not what OpenAI API is typically brought in for.
What can Comet ML do that OpenAI API cannot?
Comet ML covers Experiment tracking, Code versioning, Model registry, Hyperparameter optimization. OpenAI API covers GPT models, DALL-E, Whisper, Embeddings.
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