All tasks / Comparisons
Codex vs Grok Build
Compared only on public benchmark results, across the 1 task where both are listed: Codex is a tier higher in 1 of 1 shared task.
Codex
OpenAI's coding agent for the terminal, IDE, desktop app, web and iOS; the CLI is open source.
- Vendor
- OpenAI
- Kind
- Agents
- Runs
- Cloud
- Price
- Free tier · from $8/mo
- Skill level
- Intermediate: some setup or configuration
- Open source
- Yes
- Last verified
- 18 Oct 2026
Grok Build
xAI's terminal coding agent with plan mode, subagents and plugins for Grok models; included in the Cursor/Grok plans.
- Vendor
- SpaceXAI (xAI)
- Kind
- Agents
- Runs
- Cloud
- Price
- Free tier · from $8/mo
- Skill level
- Intermediate: some setup or configuration
- Open source
- Yes
- Last verified
- 18 Oct 2026
Task by task
| Task | Codex | Grok Build | Higher tier |
|---|---|---|---|
| Coding Coding agents | A63 on Artificial Analysis Coding Agent Index (v1.5) · Cloud | B56 on Artificial Analysis Coding Agent Index (v1.5) · Cloud | Codex |
A tier spans a range of scores, and small gaps on a leaderboard are often within its margin of error, so only a different tier counts as ahead. How we rank.
Same benchmark, both results
| Benchmark | Codex | Grok Build | Snapshot |
|---|---|---|---|
| Artificial Analysis Coding Agent Index (v1.5) Composite index: equal-weight mean of pass@1 (3 attempts/task) on DeepSWE v1.1, Terminal-Bench 4.0 and SWE-Atlas-QnA, per agent + model, higher is better | 63 | 56 | 18 Oct 2026 |
| Terminal-Bench 3.0 Accuracy: share of terminal tasks solved by an agent harness + model pair, higher is better | 34.6% | 26.5% | 18 Oct 2026 |
| Terminal-Bench 4.0 Accuracy: share of terminal tasks solved by an agent harness + model pair, higher is better | 58.2% | 37.6% | 18 Oct 2026 |