Software · head to head
OpenAI API vs Comet ML
OpenAI API
Software
GPT and DALL-E APIs for developers
- From
- $0.15/per-million-tokens
- Rated
- -
Comet ML
Software
Platform for tracking, comparing, and optimizing ML experiments
- From
- Free
- Rated
- -
The short version
- Only Comet ML has a free tier, so it costs nothing to try first.
- Each has a real cost: OpenAI API new accounts start with a $100 approved monthly usage limit and must spend cumulatively to graduate tiers; Comet ML the free cloud tier caps data at 25,000 spans a month with 60 day retention
- They diverge on capability: OpenAI API covers GPT models, Comet ML covers Experiment tracking.
Where they differ
Only the attributes on which OpenAI API and Comet ML actually diverge.
| Attribute | OpenAI API | Comet ML |
|---|---|---|
| Starting price | $0.15/per-million-tokens | Free |
| Pricing model | usage-based | freemium |
| Free tier | No | Yes |
| Platforms | Api | Web, Linux, Mac, Windows |
| Founded | 2015 | 2017 |
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 OpenAI API
- GPT models
- DALL-E
- Whisper
- Embeddings
- REST API
- SDKs
- Azure OpenAI
- Api support
Only in Comet ML
- Experiment tracking
- Code versioning
- Model registry
- Hyperparameter optimization
- Production monitoring
- PyTorch
- TensorFlow
- Keras
What people use each for
The jobs each tool is most often brought in to do.
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
Comet ML
- Tracking machine learning experiments, metrics and model versionsnot OpenAI API
- Monitoring and evaluating LLM applications with tracingnot OpenAI API
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
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
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
Pricing, plan by plan
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
Comet ML
Free- FreeFree
- 100 experiments
- Basic features
- Community support
- Team$179/month
- Unlimited experiments
- Team collaboration
- Priority support
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.
Questions people ask
- Is OpenAI API or Comet ML better?
- Neither clearly leads. OpenAI API starts at $0.15/per-million-tokens and Comet ML at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, OpenAI API or Comet ML?
- Comet ML has a free tier; the other does not. Paid plans start at $0.15/per-million-tokens for OpenAI API and Free for Comet ML.
- Does OpenAI API or Comet ML run on more platforms?
- OpenAI API runs on Api. Comet ML runs on Web, Linux, Mac, Windows.
- 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 OpenAI API best used for?
- OpenAI API is most often used for calling hosted language models from an application, generating images, audio and embeddings through one api, building agents and tool calling workflows on managed models. Of those, calling hosted language models from an application and generating images, audio and embeddings through one api are not what Comet ML is typically brought in for.
- What can OpenAI API do that Comet ML cannot?
- OpenAI API covers GPT models, DALL-E, Whisper, Embeddings. Comet ML covers Experiment tracking, Code versioning, Model registry, Hyperparameter optimization.