GPT-5.1-Codex

Timeline

1. 2025-11-13 · API availability · evidence link · evidence link

1. 2026-11-12T18:45:20.401Z · Catalogue listing · GitHub · openai/openai-node · code
   Excerpt

   6-03-17' | 'gpt-5.4-nano-2026-03-17' | 'gpt-5.3-chat-latest' | 'gpt-5.2' | 'gpt-5.2-2025-12-11' | 'gpt-5.2-chat-latest' | 'gpt-5.2-pro' | 'gpt-5.2-pro-2025-12-11' | 'gpt-5.1' | 'gpt-5.1-2025-11-13' | 'gpt-5.1-codex' | 'gpt-5.1-mini' | 'gpt-5.1-chat-latest' | 'gpt-5' | 'gpt-5-mini' | 'gpt-5-nano' | 'gpt-5-2025-08-07' | 'gpt-5-mini-2025-08-07' | 'gpt-5-nano-2025-08-07' | 'gpt-5-chat-latest' | 'gpt-4.1' | 'gpt-4.1-mini' | 'gpt-4.1-nano' | 'gpt-4.1-2025-04-14' | 'gpt-4.1-mini-2025-04-14' | 'gpt-4.1-nano-2025-04-14' | 'o4-mini' | 'o4-mini-2025-04-16' | 'o3' | 'o3-2025-04-16' | 'o3-mini' | 'o3-mini-2025-01-31' | 'o1' | 'o1-2024-12-17' | 'o1-preview' | 'o1-preview-2024-09-12' | 'o1-mini' | 'o1-mini-2024-09-12' | 'gpt-4o' | 'gpt-4o-2024

2. 2026-11-10T18:00:44.369Z · Catalogue listing · GitHub · openai/codex · code
   Excerpt

   -1".to_string(), thread_id: thread_id.to_string(), product_surface: Some("codex".to_string()), model_slug: Some("gpt-5.1-codex".to_string()), completed_at: 1, repo_hash: None, accepted_added_lines: 1, accepted_deleted_lines: 0, line_fingerprints: [], }, }, )) } fn sample_skill_track_event(thread_id: &str, plugin_id: Option<&str>) -> TrackE

   This code reference does not establish a working model identifier.

3. 2026-11-10T18:00:44.369Z · Catalogue listing · GitHub · openai/codex · code
   Excerpt

   rt| { let effort_label = Self::reasoning_effort_label(effort); format!("⚠ {effort_label} reasoning effort can quickly consume Plus plan rate limits") }); let warn_for_model = preset.model.starts_with("gpt-5.1-codex") || preset.model.starts_with("gpt-5.1-codex-max") || preset.model.starts_with("gpt-5.2"); let mut all_choices: Vec<ReasoningEffortConfig> = supported .iter() .map(|option| option.effort.clone()) .collect(); if all_choices.is_empty() { all_choices.push(default_effort.clone()); } let (choices, advanced_choices): (Vec<_>, Vec<_>) = all_choices .into_iter() .partition(|effort| !Self::is_advanced_reasoning_effort(effort)); if choices.len() == 1 && advanced_choices.is_empty() { let selecte

4. 2026-11-10T17:59:50.472Z · Catalogue listing · GitHub · openai/openai-agents-python · code
   Excerpt

   -5-mini", "gpt-5-mini-2025-08-07", "gpt-5-nano", "gpt-5-nano-2025-08-07", "gpt-5-pro", "gpt-5-pro-2025-10-06", "gpt-5.1", "gpt-5.1-2025-11-13", "gpt-5.1-codex", "gpt-5.1-codex-max", "gpt-5.1-codex-mini", "gpt-5.2", "gpt-5.2-2025-12-11", "gpt-5.2-codex", "gpt-5.2-pro", "gpt-5.2-pro-2025-12-11", "gpt-5.3-codex", "gpt-5.4-mini", "gpt-5.4-mini-2026-03-17", "gpt-5.4-nano", "gpt-5.4-nano-2026-03-17", ), 400_000, ), **_model_context_windows( ( "codex-mini-latest", "o1", "o1-2024-12-17", "o1-pro", "o1-pro-2025-03-19", "o3", "o3-2025-04-16",

5. 2026-11-10T17:58:16.002Z · Catalogue listing · GitHub · openai/openai-python · code
   Excerpt

   chat-latest", "gpt-5.2", "gpt-5.2-2025-12-11", "gpt-5.2-chat-latest", "gpt-5.2-pro", "gpt-5.2-pro-2025-12-11", "gpt-5.1", "gpt-5.1-2025-11-13", "gpt-5.1-codex", "gpt-5.1-mini", "gpt-5.1-chat-latest", "gpt-5", "gpt-5-mini", "gpt-5-nano", "gpt-5-2025-08-07", "gpt-5-mini-2025-08-07", "gpt-5-nano-2025-08-07", "gpt-5-chat-latest", "gpt-4.1", "gpt-4.1-mini", "gpt-4.1-nano", "gpt-4.1-2025-04-14", "gpt-4.1-mini-2025-04-14", "gpt-4.1-nano-2025-04-14", "o4-mini", "o4-mini-2025-04-16", "o3", "o3-2025-04-16", "o3-mini", "o3-mini-2025-01-31",

6. 2026-11-10T17:58:10.980Z · Catalogue listing · GitHub · openai/openai-agents-js · code
   Excerpt

   4', 'gpt-4.1-mini', 'gpt-4.1-mini-2025-04-14', 'gpt-4.1-nano', 'gpt-4.1-nano-2025-04-14', ]); const SANDBOX_CONTEXT_WINDOWS_400K = new Set([ 'gpt-5', 'gpt-5-codex', 'gpt-5-mini', 'gpt-5-nano', 'gpt-5-pro', 'gpt-5.1', 'gpt-5.1-codex', 'gpt-5.1-codex-max', 'gpt-5.1-codex-mini', 'gpt-5.2', 'gpt-5.2-codex', 'gpt-5.2-codex-cyber', 'gpt-5.2-pro', 'gpt-5.3-codex', 'gpt-5.3-codex-spark', 'gpt-5.4-mini', 'gpt-5.4-nano', ]); const SANDBOX_CONTEXT_WINDOWS_200K = new Set([ 'codex-mini-latest', 'o1', 'o1-2024-12-17', 'o1-pro', 'o3', 'o3-2025-04-16', 'o3-mini', 'o3-pro', 'o3-deep-research', 'o4-mini', 'o4-mini-2025-04-16', 'o4-mini-deep-research', ]); const SANDBOX_CONTEXT_WINDOWS_128K = new Set([ 'gpt-4o', 'gpt-4o-2024-08-06', 'gpt-4o-mini', 'gpt-4o-mini-2024-07-18', 'gpt-5-chat-latest', 'gpt-5.1-chat-latest', 'g

7. 2026-11-05T00:01:53.188Z · Source entry removed · OpenAI API
8. 2026-10-07T19:17:54.872Z · Evidence links · OpenAI · Codex changelog
9. 2026-10-07T19:17:54.872Z · Evidence links · OpenAI · Codex changelog
   Excerpt

   Starting today, the CLI and IDE Extension will default to gpt-5.1-codex on macOS and Linux and gpt-5.1 on Windows

10. 2026-09-17T17:42:08.188Z · Evidence links · OpenAI · API changelog
    Excerpt

    Released gpt-5.1-codex and gpt-5.1-codex-mini to the Responses API

Evidence links

• 2026-11-05T00:01:53.188Z · Source entry removed · OpenAI API · gpt-5.1-codex

Signals 1

22:0911 Sep

OpenAISighting

GPT-5.1-Codex spotted on Arena

Confirmed8 evidence links