#164
OP
GPT-4.1-nano
OpenAI
11.4 LLMBoard
OpenAI model product
GPT-5.1 Codex is a version of GPT-5.1 optimized for agentic coding tasks in Codex or similar environments. It features higher reasoning capabilities and is available in the Responses API. The underlying model snapshot is regularly updated.
Updated Aug 10, 2026. Default version: GPT-5.1 Codex
Structured fields from the published default version.
This profile uses the latest version under this unique model that has a calculated LLMBoard score. Arena and price are excluded.
No published version under this unique model currently has enough benchmark coverage to calculate a score.
Published benchmark records for the scored version currently unavailable.
No published benchmark result is linked to the scored version.
Preference and agent-evaluation signals from published Arena datasets.
| webdev | webdev-html | 83 | 1346.0 | 4,814 | N/A | |
| webdev | overall | 84 | 1336.1 | 4,830 | N/A | |
| webdev | webdev | 84 | 1336.1 | 4,830 | N/A |
Official vendor API PAYG pricing is summarized first. The table then lists individual provider offerings without treating their minimum as the official price.
| OpenCode Zen | gpt-5.1-codex | global | $1.07 | $8.5 | 400K | |
| Jiekou.AI | gpt-5.1-codex | global | $1.13 | $9 | 400K | |
| Vivgrid | gpt-5.1-codex | global | $1.25 | $10 | 400K | |
| LLM Gateway | gpt-5.1-codex | global | $1.25 | $10 | 400K | |
| Helicone | gpt-5.1-codex | global | $1.25 | $10 | 400K | |
| Abacus | gpt-5.1-codex | global | $1.25 | $10 | 400K | |
| Azure Cognitive Services | gpt-5.1-codex | global | $1.25 | $10 | 400K | |
| Azure | gpt-5.1-codex | global | $1.25 | $10 | 400K | |
| AIHubMix | gpt-5.1-codex | global | $1.25 | $10 | 400K |
Official prices use only the vendor's configured official Provider and positive standard USD PAYG rates. Third-party offers remain explicitly labeled.
All published versions linked to this unique model. The score columns identify the version used by the current overall ranking.
| GPT-5.1 Codex | N/A | N/A | 400K | 128K | No | Proprietary | |
| GPT-5.1 Codex High | N/A | N/A | 400K | 128K | No | Proprietary |
A concise description based on the published model registry.
GPT-5.1 Codex is a version of GPT-5.1 optimized for agentic coding tasks in Codex or similar environments. It features higher reasoning capabilities and is available in the Responses API. The underlying model snapshot is regularly updated.
Use the benchmark, Arena and pricing sections above as separate evidence. A missing field means the current data snapshot does not support that claim.
Data snapshot: 2026-08-07. Editorial model content is not available in the backend.
Recommendations prioritize the same model type and family, then the closest published LLMBoard score.
Common questions about GPT-5.1-Codex.
GPT-5.1-Codex's default version was released on Nov 19, 2025.
No official standard PAYG price is currently available for GPT-5.1-Codex. The lowest tracked third-party offer starts at $1.07 input and $8.5 output via OpenCode Zen.
GPT-5.1-Codex is published under OpenAI in the model registry.
The default version has a 400K token context window.
No. The default version is not marked as having publicly available weights.
9 published provider offerings are linked to the default version.
No nearby ranked alternatives are currently available.