---
title: "keras vs CTranslate2"
type: "comparison"
canonical_url: "https://www.graphcanon.com/compare/keras-team-keras-vs-opennmt-ctranslate2"
tools: ["keras-team-keras", "opennmt-ctranslate2"]
---

# keras vs CTranslate2

*GraphCanon updated Jul 12, 2026*

## Verdict

Pick keras when keras is primarily Python; CTranslate2 is C++; pick CTranslate2 when cTranslate2 is primarily C++; keras is Python.

[keras](http://keras.io/) reports 64k GitHub stars, 20k forks, and 228 open issues, last pushed Jul 7, 2026. [CTranslate2](https://opennmt.net/CTranslate2) has 4.6k stars, 498 forks, and 271 open issues, last pushed Jul 3, 2026. Figures are from public GitHub metadata via [keras's repository](https://github.com/keras-team/keras) and [CTranslate2's repository](https://github.com/OpenNMT/CTranslate2).

| | [keras](/tools/keras-team-keras.md) | [CTranslate2](/tools/opennmt-ctranslate2.md) |
| --- | --- | --- |
| Tagline | Deep Learning for humans | Fast inference engine for Transformer models |
| Stars | 64,191 | 4,566 |
| Forks | 19,752 | 498 |
| Open issues | 228 | 271 |
| Language | Python | C++ |
| Adopt for | - | - |
| Persona | - | - |
| Runtime | - | - |
| License | Apache-2.0 | MIT |
| Categories | Model Training | Inference & Serving |

## Trust and health

_Sourced signals - not a safety guarantee. No winner column._

| | [keras](/tools/keras-team-keras.md) | [CTranslate2](/tools/opennmt-ctranslate2.md) |
| --- | --- | --- |
| Maintenance | Very active (96%) | Active (82%) |
| Days since push | 4d | 8d |
| Open issues (now) | 228 | 271 |
| Security scan | No criticals | No lockfile |
| Full report | [trust report](/tools/keras-team-keras/trust.md) | [trust report](/tools/opennmt-ctranslate2/trust.md) |

## Shared compatibility

- **Python**: [keras](/tools/keras-team-keras.md) - Python runtime; [CTranslate2](/tools/opennmt-ctranslate2.md) - Python runtime

## Choose when

### Choose keras if…

- keras is primarily Python; CTranslate2 is C++.
- License: keras is Apache-2.0, CTranslate2 is MIT.
- Tags unique to keras: data-science, neural-networks, machine-learning, python.
- Also covers Model Training.

### Choose CTranslate2 if…

- CTranslate2 is primarily C++; keras is Python.
- License: CTranslate2 is MIT, keras is Apache-2.0.
- Tags unique to CTranslate2: avx, cpp, cuda, machine-translation.
- Also covers Inference & Serving.

## When NOT to use keras

- Model Training: Try prompting and RAG first; fine-tuning is the answer to style/format, not missing knowledge.

## When NOT to use CTranslate2

- Inference & Serving: Self-hosting rarely beats a hosted API on cost until you have steady, high-volume traffic.

## Common questions

### What is the difference between keras and CTranslate2?

keras: Deep Learning for humans. CTranslate2: Fast inference engine for Transformer models. See the comparison table for live GitHub stats and shared categories.

### When should I choose keras over CTranslate2?

Choose keras over CTranslate2 when keras is primarily Python; CTranslate2 is C++; License: keras is Apache-2.0, CTranslate2 is MIT; Tags unique to keras: data-science, neural-networks, machine-learning, python; Also covers Model Training.

### When should I choose CTranslate2 over keras?

Choose CTranslate2 over keras when CTranslate2 is primarily C++; keras is Python; License: CTranslate2 is MIT, keras is Apache-2.0; Tags unique to CTranslate2: avx, cpp, cuda, machine-translation; Also covers Inference & Serving.

### When should I avoid keras?

Model Training: Try prompting and RAG first; fine-tuning is the answer to style/format, not missing knowledge.

### When should I avoid CTranslate2?

Inference & Serving: Self-hosting rarely beats a hosted API on cost until you have steady, high-volume traffic.

### Is keras or CTranslate2 more popular on GitHub?

keras has more GitHub stars (64,191 vs 4,566). Stars measure visibility, not whether either tool fits your constraints.

### Are keras and CTranslate2 open source?

Yes - both are open-source projects on GitHub (keras: Apache-2.0, CTranslate2: MIT).

### Where can I find alternatives to keras or CTranslate2?

GraphCanon lists graph-backed alternatives at [keras alternatives](/tools/keras-team-keras/alternatives) and [CTranslate2 alternatives](/tools/opennmt-ctranslate2/alternatives) ([keras markdown twin](/tools/keras-team-keras/alternatives.md), [CTranslate2 markdown twin](/tools/opennmt-ctranslate2/alternatives.md)), ranked by typed relationship edges rather than popularity votes.

### Is there a machine-readable version of this comparison?

Yes. The markdown twin at [this comparison](/compare/keras-team-keras-vs-opennmt-ctranslate2.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers.

### Which is better maintained, keras or CTranslate2?

keras: Very active. CTranslate2: Active. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance.

### Where are the full trust reports for keras and CTranslate2?

GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [keras trust report](/tools/keras-team-keras/trust); [CTranslate2 trust report](/tools/opennmt-ctranslate2/trust).

---

**Machine-readable endpoints**

- JSON: [`/api/graphcanon/graph?tool=keras-team-keras`](/api/graphcanon/graph?tool=keras-team-keras)
- LLM index: [/llms.txt](/llms.txt)
- Full corpus: [/llms-full.txt](/llms-full.txt)

_GraphCanon - The knowledge graph for AI development. https://www.graphcanon.com/_