ChatOpenAI

GPT-5 Codex AI Chat Assistant

GPT-5 Codex is Rivya's baseline GPT Codex AI coding assistant for code review, debugging, implementation planning, and practical engineering questions.

Input
Prompt + optional images
Output
AI Chat Assistant
Credits
Pay per use — credits based on usage
Best for
Code review and bug fixing
Example output

Example output

Best for repo migrations, compatibility fallbacks, and careful rollout planning.

Responses

Online trial

Try GPT-5 Codex

Input setup

Prepare this run

Estimated credits: 3+

Chat controls

Choose when Rivya can search the web, how much reasoning it should use, and whether to include model thoughts when the selected model supports them.

Web search

Allow supported models to pull live web results during the reply.

Reasoning

Use the model default, or request a stronger or lighter reasoning level when available.

Start a conversation to turn planning, prompting, and creative direction into one reusable thread.

Prompt starters

Start GPT-5 Codex with a proven prompt

Use a template already mapped to GPT-5 Codex when you want a stronger first run than a blank prompt.

Model proof

What GPT-5 Codex output looks like

Use the online trial above, then compare these example results to judge finish, rhythm, and task fit before you spend more credits in Studio.

chat thread

Ask Rivya to help with planning, prompting, analysis, or coding.

Chat preview for a code migration plan prompt in Rivya.

Output

Best for repo migrations, compatibility fallbacks, and careful rollout planning.

Lead sample

Best for repo migrations, compatibility fallbacks, and careful rollout planning.

Chat preview for a code migration plan prompt in Rivya.

Input

Prompt + optional images

What to notice

Chat preview for a code migration plan prompt in Rivya.

Credits per use

Pay per use — credits based on usage

Why this model works

Why this model works

Code-specialized with 12K output token limit

Optimized for code generation and debugging

Vision support for analyzing screenshots/diagrams

Best-fit tasks

Best-fit tasks

Code review and bug fixingImplementation planning and repo walkthroughsRefactoring single services or modulesExplaining stack traces and failing behavior

Model proof

chat thread

Ask Rivya to help with planning, prompting, analysis, or coding.

Conversation preview for Legacy Module Map Chat.

Map a legacy module into responsibilities, callers, data flow, risky assumptions, and a safe first change.

Conversation preview for Legacy Module Map Chat.

chat thread

Ask Rivya to help with planning, prompting, analysis, or coding.

Conversation preview for Failing Test Root Cause Chat.

Turn a failing test log and recent diff summary into likely causes, reproduction steps, and a minimal fix path.

Conversation preview for Failing Test Root Cause Chat.

chat thread

Ask Rivya to help with planning, prompting, analysis, or coding.

Conversation preview for API Contract Review Chat.

Review an API change for contract drift, caller impact, validation gaps, and rollout notes.

Conversation preview for API Contract Review Chat.

chat thread

Ask Rivya to help with planning, prompting, analysis, or coding.

Conversation preview for Database Migration Risk Chat.

Review a database migration plan for data loss risk, backfill order, rollback limits, and verification queries.

Conversation preview for Database Migration Risk Chat.

chat thread

Ask Rivya to help with planning, prompting, analysis, or coding.

Conversation preview for Refactor Ticket Breakdown.

Break a broad refactor request into scoped tickets with owners, risks, and verification per ticket.

Conversation preview for Refactor Ticket Breakdown.

chat thread

Ask Rivya to help with planning, prompting, analysis, or coding.

Conversation preview for Legacy Module Map Chat.

Map a legacy module into responsibilities, callers, data flow, risky assumptions, and a safe first change.

Conversation preview for Legacy Module Map Chat.

chat thread

Ask Rivya to help with planning, prompting, analysis, or coding.

Conversation preview for Failing Test Root Cause Chat.

Turn a failing test log and recent diff summary into likely causes, reproduction steps, and a minimal fix path.

Conversation preview for Failing Test Root Cause Chat.

chat thread

Ask Rivya to help with planning, prompting, analysis, or coding.

Conversation preview for API Contract Review Chat.

Review an API change for contract drift, caller impact, validation gaps, and rollout notes.

Conversation preview for API Contract Review Chat.

chat thread

Ask Rivya to help with planning, prompting, analysis, or coding.

Conversation preview for Database Migration Risk Chat.

Review a database migration plan for data loss risk, backfill order, rollback limits, and verification queries.

Conversation preview for Database Migration Risk Chat.

chat thread

Ask Rivya to help with planning, prompting, analysis, or coding.

Conversation preview for Refactor Ticket Breakdown.

Break a broad refactor request into scoped tickets with owners, risks, and verification per ticket.

Conversation preview for Refactor Ticket Breakdown.

Decision fit

When this model is the right choice

Decision fit

Fit signals

Code-specialized with 12K output token limit
Optimized for code generation and debugging
Vision support for analyzing screenshots/diagrams
Responses API for structured output
20K-character context for complex codebases

Best-fit tasks

Use it when the task looks like this

Code review and bug fixingImplementation planning and repo walkthroughsRefactoring single services or modulesExplaining stack traces and failing behaviorDeveloper tooling and script generation

Quiet facts

Inputs, output, and credits to confirm

Provider

OpenAI

Category

Chat

Capabilities

Responses

Credit model

Pay per use — credits based on usage

Input path

Prompt + optional images

Prompt setup

Up to 20,000 chars

Developer access

Available via API

Call GPT-5 Codex from Public API v1 after checking the model fields, reference media rules, and credit behavior.

FAQ

GPT-5 Codex FAQ

Compare alternatives

Other models to consider next

Chat

GPT-5.5

OpenAI's advanced GPT chat model on Rivya for complex reasoning, image-aware analysis, research synthesis, and structured writing when the brief needs more room.

Why consider it

Consider it when the credit note fits your next run: Pay per use - credits based on usage.

InputPrompt + optional images
CreditsPay per use - credits based on usage
Best forResearch synthesis across long or messy source packets
Chat

GPT-5.4

OpenAI's higher-end AI chat model on Rivya, with stronger structured input handling, reasoning control, and tool-oriented conversation projects for more complex analysis and writing tasks.

Why consider it

Consider it for this task fit: Long strategic briefs and decision memos.

InputPrompt + optional images
CreditsPay per use — credits based on usage
Best forLong strategic briefs and decision memos
Chat

GPT-5.4 Codex

OpenAI's higher-end Codex model on Rivya, with stronger coding, structured reasoning, and tool-oriented collaboration for demanding repo-scale development projects.

Why consider it

Consider it for this task fit: Repo-scale debugging and architecture review.

InputPrompt + optional images
CreditsPay per use — credits based on usage
Best forRepo-scale debugging and architecture review