Codex
OpenAI • agentFeatured
OpenAI agentic coding product spanning local CLI, cloud environments and multi-agent workflows for software development.
Specifications
Context Window
—
Input Price/1M
—
Output Price/1M
—
Parameters
—
Benchmarks
Codex results on the main AI model evaluation benchmarks. Higher scores indicate better performance.
agent
| Benchmark | Score | Maximum | Methodology |
|---|---|---|---|
| SWEN Agent Composite | 94.0 | 100.0 | SWEN Agent Registry v2026-06-22. Editorial multimodal ranking with modality-specific scoring based on product capability, control, speed, value and integration readiness. |
Autonomy
| Benchmark | Score | Maximum | Methodology |
|---|---|---|---|
| SWEN Agent Autonomy | 95.0 | 100.0 | SWEN Agent Registry v2026-06-22. Editorial multimodal ranking with modality-specific scoring based on product capability, control, speed, value and integration readiness. |
Integration
| Benchmark | Score | Maximum | Methodology |
|---|---|---|---|
| SWEN Agent Integration | 95.0 | 100.0 | SWEN Agent Registry v2026-06-22. Editorial multimodal ranking with modality-specific scoring based on product capability, control, speed, value and integration readiness. |
Reliability
| Benchmark | Score | Maximum | Methodology |
|---|---|---|---|
| SWEN Agent Reliability | 92.0 | 100.0 | SWEN Agent Registry v2026-06-22. Editorial multimodal ranking with modality-specific scoring based on product capability, control, speed, value and integration readiness. |
Tool Use
| Benchmark | Score | Maximum | Methodology |
|---|---|---|---|
| SWEN Agent Tool Use | 96.0 | 100.0 | SWEN Agent Registry v2026-06-22. Editorial multimodal ranking with modality-specific scoring based on product capability, control, speed, value and integration readiness. |
Value
| Benchmark | Score | Maximum | Methodology |
|---|---|---|---|
| SWEN Agent Value | 84.0 | 100.0 | SWEN Agent Registry v2026-06-22. Editorial multimodal ranking with modality-specific scoring based on product capability, control, speed, value and integration readiness. |
Information
- Tool Calling
- ✅ Supported
- Vision
- ❌ Not supported
- Audio
- ❌ Not supported
- Tags
- agentcoding-agentswen-curated-registryopenaicodexrealtimetool-usecode-execution
Full Analysis: Codex
What is Codex?
Codex is an AI model developed by OpenAI, classified as a agent model. It focuses on text processing and natural language generation. As a proprietary model, it is available via OpenAI's cloud API.
Pricing & Costs in 2026
Codex does not have public per-token pricing available at this time. Some models offer access via enterprise plans or research programs. Check OpenAI's official website for up-to-date availability and pricing.
Benchmarks & Performance
Codex was evaluated on 6 different benchmarks, covering categories like agent, Autonomy, Integration, Reliability, Tool Use, Value. Results show exceptional performance across available evaluations.
It's important to note that benchmarks measure specific aspects and don't capture the full user experience. Factors like instruction adherence, behavior in long conversations, and real-world task quality vary significantly between models and aren't always reflected in standard scores.
Recommended Use Cases
Codex specializes in agent, offering advanced capabilities for creating and processing agent content.
Comparison with Alternatives
In the 2026 AI model ecosystem, Codex competes directly with similarly capable models. Key competitors include Claude (Anthropic), Gemini (Google), and open source models like Llama (Meta) and Qwen (Alibaba). The choice between models depends on the specific use case, budget, latency requirements, and need for features like multimodality and tool calling.
For a detailed side-by-side comparison, use our comparison tool or check the overall model ranking.
Frequently Asked Questions
What is Codex?
OpenAI agentic coding product spanning local CLI, cloud environments and multi-agent workflows for software development.
How much does Codex cost?
Codex does not have public per-token pricing available at this time. Check OpenAI's official website for up-to-date information.
How does Codex compare with other models?
In available benchmarks, Codex scored: SWEN Agent Composite: 94/100, SWEN Agent Autonomy: 95/100, SWEN Agent Integration: 95/100. See the full table above for a detailed comparison.
Is Codex open source?
No, Codex is a proprietary model from OpenAI. It is available via cloud API. For open source alternatives, check our open source model ranking.
What is Codex best for?
Codex excels at general-purpose language tasks. It supports tool calling for API integrations and automation.
Last updated: June 22, 2026 • View methodology →