--- schema: 1 type: video title: OpenAI Codex Masterclass — Vaibhav Srivastav & Katia Gil Guzman description: >- Codex is no longer just a coding assistant in a terminal. In this workshop, Vaibhav and Katia show how it becomes a full software engineering system, combining frontier models, the Codex app and CLI, plugins, automations, and subagents that can explore, review, and execute work in parallel. The session also dives into custom subagents: showing how specialized agents with different models, permissions, and tools can speed up code review, research, debugging, and long-running tasks while keeping control and safety in place. Speaker info: - Vaibhav Srivastav | https://x.com/reach_vb - Katia Gil Guzman | https://www.linkedin.com/in/katiagilguzman/ Timestamps (0:14) Introduction to the workshop and speakers (1:48) What is Codex? (Overview of software engineering agent capabilities) (2:18) Foundation models (GPT-5.3, Spark, GPT-5.4) (4:11) The evolution of models and performance improvements (Websockets, Fast Mode) (7:04) Codex app features, projects, and work trees (8:37) Automations overview (12:28) Plugins: Skills, apps, and MCP servers (15:13) Game and Web development plugins (Playwright and Image Gen) (16:26) Demo: Game studio plugin and generating assets (17:23) Demo: Google Drive plugin for codebase data (18:52) Demo: Setting up automations for Slack and Gmail (27:14) Code Review features and integration with GitHub (32:39) Subagents: Parallelizing tasks and custom personas (36:18) Demo: Using subagents to review persona files (44:52) Creating custom subagents (49:29) Bleeding edge features: Guardian approvals, hooks, and personality settings (56:11) Codex security and Cloud Code plugin (57:10) Q&A session --- Watch along with the corrected transcript, summary, timestamps and resources on this talk's official AIE page: https://ai.engineer/talks/MhHEGMFCEB0-codex-and-subagents Join our upcoming AI Engineer conferences (see https://ai.engineer landing page): - AIEi Shanghai, November 5–6 — the first for meeting top Chinese labs and engineers - AIE CODE in SF, November 10–12 — the top AI Coding conference returns - AIEi Sydney, December 7–8 — the first AIEi run alongside NeurIPS 2026 in Sydney --- canonical: >- https://liquidgold.cc/channel/aidotengineer/explore/video/openai-codex-masterclass-vaibhav-srivastav-katia-gi-f68f1c0af531 markdown: >- https://liquidgold.cc/channel/aidotengineer/video/openai-codex-masterclass-vaibhav-srivastav-katia-gi-f68f1c0af531.md llms: null parent: 'https://liquidgold.cc/channel/aidotengineer.md' channel: aidotengineer updated: '2026-10-24T14:37:57.687Z' language: null children: [] videoId: MhHEGMFCEB0 durationSeconds: 3719 publishedAt: '2026-04-29T16:00:06.000Z' searchChunks: - ordinal: 0 text: null startSeconds: 123 endSeconds: 135 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=123' heldReason: rights - ordinal: 1 text: null startSeconds: 135 endSeconds: 238 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=135' heldReason: rights - ordinal: 2 text: null startSeconds: 135 endSeconds: 238 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=135' heldReason: rights - ordinal: 3 text: null startSeconds: 135 endSeconds: 238 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=135' heldReason: rights - ordinal: 4 text: null startSeconds: 249 endSeconds: 380 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=249' heldReason: rights - ordinal: 5 text: null startSeconds: 390 endSeconds: 490 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=390' heldReason: rights - ordinal: 6 text: null startSeconds: 390 endSeconds: 490 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=390' heldReason: rights - ordinal: 7 text: null startSeconds: 501 endSeconds: 598 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=501' heldReason: rights - ordinal: 8 text: null startSeconds: 501 endSeconds: 598 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=501' heldReason: rights - ordinal: 9 text: null startSeconds: 707 endSeconds: 833 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=707' heldReason: rights - ordinal: 10 text: null startSeconds: 707 endSeconds: 833 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=707' heldReason: rights - ordinal: 11 text: null startSeconds: 844 endSeconds: 947 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=844' heldReason: rights - ordinal: 12 text: null startSeconds: 947 endSeconds: 957 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=947' heldReason: rights - ordinal: 13 text: null startSeconds: 957 endSeconds: 1077 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=957' heldReason: rights - ordinal: 14 text: null startSeconds: 1088 endSeconds: 1169 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=1088' heldReason: rights - ordinal: 15 text: null startSeconds: 1180 endSeconds: 1282 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=1180' heldReason: rights - ordinal: 16 text: null startSeconds: 1709 endSeconds: 1792 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=1709' heldReason: rights - ordinal: 17 text: null startSeconds: 1803 endSeconds: 1913 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=1803' heldReason: rights - ordinal: 18 text: null startSeconds: 1924 endSeconds: 2012 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=1924' heldReason: rights - ordinal: 19 text: null startSeconds: 2023 endSeconds: 2106 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=2023' heldReason: rights - ordinal: 20 text: null startSeconds: 2117 endSeconds: 2220 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=2117' heldReason: rights - ordinal: 21 text: null startSeconds: 2231 endSeconds: 2313 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=2231' heldReason: rights - ordinal: 22 text: null startSeconds: 2415 endSeconds: 2427 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=2415' heldReason: rights - ordinal: 23 text: null startSeconds: 2427 endSeconds: 2510 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=2427' heldReason: rights - ordinal: 24 text: null startSeconds: 2521 endSeconds: 2614 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=2521' heldReason: rights - ordinal: 25 text: null startSeconds: 2614 endSeconds: 2625 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=2614' heldReason: rights - ordinal: 26 text: null startSeconds: 2772 endSeconds: 2894 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=2772' heldReason: rights - ordinal: 27 text: null startSeconds: 2906 endSeconds: 3030 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=2906' heldReason: rights - ordinal: 28 text: null startSeconds: 3030 endSeconds: 3041 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=3030' heldReason: rights - ordinal: 29 text: null startSeconds: 3150 endSeconds: 3242 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=3150' heldReason: rights - ordinal: 30 text: null startSeconds: 3242 endSeconds: 3253 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=3242' heldReason: rights - ordinal: 31 text: null startSeconds: 3343 endSeconds: 3354 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=3343' heldReason: rights - ordinal: 32 text: null startSeconds: 3343 endSeconds: 3354 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=3343' heldReason: rights - ordinal: 33 text: null startSeconds: 3472 endSeconds: 3574 watch: 'https://liquidgold.cc/watch/MhHEGMFCEB0?t=3472' heldReason: rights --- # OpenAI Codex Masterclass — Vaibhav Srivastav & Katia Gil Guzman Codex is no longer just a coding assistant in a terminal. In this workshop, Vaibhav and Katia show how it becomes a full software engineering system, combining frontier models, the Codex app and CLI, plugins, automations, and subagents that can explore, review, and execute work in parallel. The session also dives into custom subagents: showing how specialized agents with different models, permissions, and tools can speed up code review, research, debugging, and long-running tasks while keeping control and safety in place. Speaker info: - Vaibhav Srivastav | https://x.com/reach_vb - Katia Gil Guzman | https://www.linkedin.com/in/katiagilguzman/ Timestamps (0:14) Introduction to the workshop and speakers (1:48) What is Codex? (Overview of software engineering agent capabilities) (2:18) Foundation models (GPT-5.3, Spark, GPT-5.4) (4:11) The evolution of models and performance improvements (Websockets, Fast Mode) (7:04) Codex app features, projects, and work trees (8:37) Automations overview (12:28) Plugins: Skills, apps, and MCP servers (15:13) Game and Web development plugins (Playwright and Image Gen) (16:26) Demo: Game studio plugin and generating assets (17:23) Demo: Google Drive plugin for codebase data (18:52) Demo: Setting up automations for Slack and Gmail (27:14) Code Review features and integration with GitHub (32:39) Subagents: Parallelizing tasks and custom personas (36:18) Demo: Using subagents to review persona files (44:52) Creating custom subagents (49:29) Bleeding edge features: Guardian approvals, hooks, and personality settings (56:11) Codex security and Cloud Code plugin (57:10) Q\&A session --- Watch along with the corrected transcript, summary, timestamps and resources on this talk's official AIE page: https://ai.engineer/talks/MhHEGMFCEB0-codex-and-subagents Join our upcoming AI Engineer conferences (see https://ai.engineer landing page): - AIEi Shanghai, November 5–6 — the first for meeting top Chinese labs and engineers - AIE CODE in SF, November 10–12 — the top AI Coding conference returns - AIEi Sydney, December 7–8 — the first AIEi run alongside NeurIPS 2026 in Sydney --- Canonical: https://liquidgold.cc/channel/aidotengineer/explore/video/openai-codex-masterclass-vaibhav-srivastav-katia-gi-f68f1c0af531 · Channel: [AI Engineer](https://liquidgold.cc/channel/aidotengineer.md) > Search chunk text is held until public-source provenance is verified. ## Document chunks --- #### Chunk 0: Document excerpt (0:14 to 2:03) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 1: Document excerpt (2:03 to 2:15) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 2: Document excerpt (2:15 to 3:58) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 3: Document excerpt (3:58 to 4:09) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 4: Document excerpt (4:09 to 6:20) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 5: Document excerpt (6:20 to 8:10) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 6: Document excerpt (8:10 to 9:58) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 7: Document excerpt (9:58 to 11:47) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 8: Document excerpt (11:47 to 13:53) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 9: Document excerpt (13:53 to 14:04) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 10: Document excerpt (14:04 to 15:47) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 11: Document excerpt (15:47 to 15:57) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 12: Document excerpt (15:57 to 17:57) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 13: Document excerpt (17:57 to 19:29) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 14: Document excerpt (19:29 to 21:22) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 15: Document excerpt (21:22 to 23:01) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 16: Document excerpt (23:01 to 24:32) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 17: Document excerpt (24:32 to 26:33) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 18: Document excerpt (26:33 to 28:18) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 19: Document excerpt (28:18 to 30:03) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 20: Document excerpt (30:03 to 31:53) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 21: Document excerpt (31:53 to 33:32) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 22: Document excerpt (33:32 to 35:06) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 23: Document excerpt (35:06 to 37:00) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 24: Document excerpt (37:00 to 38:33) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 25: Document excerpt (38:33 to 40:15) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 26: Document excerpt (40:15 to 41:50) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 27: Document excerpt (41:50 to 43:34) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 28: Document excerpt (43:34 to 43:45) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 29: Document excerpt (43:45 to 45:59) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 30: Document excerpt (45:59 to 48:26) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 31: Document excerpt (48:26 to 50:30) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 32: Document excerpt (50:30 to 52:19) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 33: Document excerpt (52:19 to 54:02) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 34: Document excerpt (54:02 to 55:54) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 35: Document excerpt (55:54 to 57:41) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 36: Document excerpt (57:41 to 59:34) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 37: Document excerpt (59:34 to 59:44) > Held: transcript rights do not permit this chunk's text. --- #### Chunk 38: Document excerpt (59:44 to 61:59) > Held: transcript rights do not permit this chunk's text.