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AI Chat & AssistantsAI Agents & AutomationImage GenerationVideo Generation & EditingVoice Cloning & Voice ConversionCoding & Developer Tools

EXPLORE AI MODELS

Claude CodeOpenAI CodexCursorGitHub CopilotLovable
BELLISTE / AI COMPARISON

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OpenAI

OpenAI Codex

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SECOND MODEL

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OverviewOpenAI CodexSecond model
PriceFree $0/month · Go $8/month · Plus $20/month; monthly USD subscription prices. API usage is billed separately.—
Free planFree access is included with limited model/client availability; Free and Go currently list GPT-6 Luna Standard in desktop, subject to rollout. A universal paid-plan trial duration is not disclosed.—
Paid plansGo $8/month · Plus $20/month · Pro $100, $200 or $500/month. Business: $20/user/month billed annually, or $25 monthly, minimum 2 users. Enterprise/Edu: contact sales. Model and interface access vary; API usage is separate.—
Usage limitsAllowance depends on model, reasoning, speed and task. Plus/Standard Business publish 5-hour estimates; weekly limits may apply. Pro currently has no 5-hour limit. Extra credits and API billing are separate.—
SpecializationCoding Agent · Code Generation · Debugging · Code Review · Refactoring · Development Automation—
QualityCan inspect changes and run project checks when tools are available. Results depend on model, repository context and verification quality. Belliste has not run a comparative benchmark for this profile.—
FeaturesMulti-file code generation and editing · Repository exploration and debugging · Test generation and execution · Local and connected pull-request review · Terminal commands and development tools · Planning, permissions and sandbox controls · Parallel subagents and Git worktrees · Local and cloud execution · AGENTS.md instructions and optional memory · MCP, plugins and external integrations · Screenshot-guided coding · CLI, SDK and app-server automation
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Overview & Compatibility

9 specifications +
SpecificationOpenAI CodexSecond model
Starting PriceFree $0/month · Go $8/month · Plus $20/month; monthly USD subscription prices. API usage is billed separately.Not specified
Tool TypeCoding Agent / IDE Assistant; local development and cloud task workflows.Not specified
Primary Use CaseImplement features, investigate bugs, review changes and automate repository maintenance.Not specified
Best ForIndividual developers and engineering teams working with repositories, tests and code review.Not specified
Access MethodsDesktop app · CLI · IDE extension/integrations · Web/cloud; mobile cloud access depends on plan and client.Not specified
Supported Operating SystemsWindows, macOS and Linux; CLI also runs in WSL. Installation, sandboxing and desktop capabilities differ by OS.Not specified
Supported IDEs & EditorsVS Code, VS Code Insiders, Cursor and compatible editors; Xcode and JetBrains offer separate integrations.Not specified
Programming LanguagesWorks across programming languages through source files and installed project tools. No exhaustive language-by-language compatibility guarantee is disclosed.Not specified
Framework SupportUses the project’s framework, dependencies and build tools. A complete framework certification/support matrix is not disclosed.Not specified

Coding Capabilities

11 specifications +
SpecificationOpenAI CodexSecond model
Code CompletionTraditional as-you-type inline code autocomplete: Not disclosed. Codex documents prompted coding, editor-context input and diff review.Not specified
Code GenerationGenerates code and files from instructions in an existing repository or new project.Not specified
Inline Code EditingUses selected editor code and open files as context for requested changes; edits can be reviewed beside the source.Not specified
Multi-File EditingCan change multiple files in one repository task and present the resulting diff for review.Not specified
Code ExplanationExplains repository structure, functions and unfamiliar implementation details using accessible files.Not specified
RefactoringRefactors existing code using project instructions and can verify the result with available checks.Not specified
Debugging AssistanceInvestigates error reports, traces code paths and implements fixes; available logs and tests improve verification.Not specified
Test GenerationCan write tests for requested behavior and regressions using the project’s testing tools.Not specified
Documentation GenerationCan draft or update README files, code comments and project documentation from repository context.Not specified
Code ReviewOn-demand /review for local Git changes; connected PR reviews and automatic GitHub reviews require the relevant integration, permissions and account access. GitLab review integration is beta.Not specified
Image-to-CodeAccepts screenshots, diagrams and mockups as input for code changes and UI implementation; supports image input in CLI and editor workflows.Not specified

Agents & Execution

9 specifications +
SpecificationOpenAI CodexSecond model
Agent Mode & PlanningAgent can inspect, plan, edit and verify a task. Planning and execution follow the selected mode and permission policy.Not specified
Terminal Command ExecutionRuns shell commands, builds and installed development tools within the allowed filesystem and network scope.Not specified
Automated Test ExecutionRuns available test suites, reads failures and can iterate on fixes; dependencies and test infrastructure must be configured.Not specified
Browser InteractionBuilt-in interactive browser in the desktop app for sites and local previews. It is not built into Codex CLI or IDE extension; browser tools can be added separately where supported.Not specified
Background / Cloud AgentsCloud tasks run in isolated workspaces and continue while the local computer sleeps. Local background work depends on the host remaining available.Not specified
Parallel Agent TasksSupports parallel subagents and separate concurrent tasks; Git worktrees help isolate repository changes. Parallel work increases usage.Not specified
Human Approval ControlsPermission profiles control file, network and execution access. Requests outside permitted scope can require approval; managed settings can constrain available policies.Not specified
Execution Isolation / SandboxmacOS uses Seatbelt; Linux/WSL2 use the Linux sandbox; native Windows has a Windows sandbox. Cloud tasks get isolated workspaces. Isolation depends on configuration.Not specified
Execution EnvironmentBoth: local CLI/IDE/desktop execution and Codex Cloud tasks. Remote-model inference is separate from where commands execute.

AI Models & Codebase Context

8 specifications +
SpecificationOpenAI CodexSecond model
Supported AI ModelsGPT-6.1 Sol, GPT-6 Sol, GPT-6 Luna and GPT-6 Astra where eligible. GPT-5.6 variants remain during rollout; model access depends on plan, client and sign-in method.Not specified
Model SelectionConfigurable defaults plus manual model/reasoning selection via the picker, /model or --model. Available settings depend on client and workspace policy.Not specified
Bring Your Own API KeySupports OpenAI API-key authentication in CLI, SDK and IDE workflows. API billing is separate; ChatGPT-dependent cloud features are limited or unavailable with API-key sign-in.Not specified
Local Model SupportCLI OSS mode supports local providers such as Ollama and LM Studio via --oss. Hardware, model tool support and feature compatibility vary.Not specified
Codebase Context & IndexingReads and searches accessible repository files, uses editor selections and project guidance. A universal persistent semantic-index specification is not disclosed.Not specified
Context WindowModel/provider dependent; context usage and compaction affect a session. No single fixed Codex-wide context window is disclosed; API model maximums do not guarantee equivalent usable product context.Not specified
Custom Instructions / RulesAGENTS.md provides repository and directory instructions; user/project configuration and execution rules add workflow constraints.Not specified
Persistent Project MemoryOptional local memory carries useful context across eligible chats. Desktop, CLI and IDE use the host’s local store; it is separate from ChatGPT web memory.Not specified

Developer Workflow & Integrations

5 specifications +
SpecificationOpenAI CodexSecond model
Git & Pull RequestsLocal Git diff, branch/worktree and change-review workflows. Authenticated Git tools/integrations can prepare and create pull requests; remote-provider permissions apply.Not specified
MCP & External IntegrationsMCP supports external tools and data sources. Plugins and integrations can connect GitHub, GitLab beta, Slack, Linear and other services; availability and permissions differ.Not specified
Web SearchWeb search is supported, with availability and network behavior determined by client, configuration and workspace policy.Not specified
API / SDK AccessCodex SDKs for TypeScript and Python, app-server for custom clients, and codex exec for automation/CI. Authentication and usage billing follow the chosen runtime.Not specified
Deployment SupportCan run deployment commands or connected tools with permission. Sites adds a build/publish workflow on eligible clients and plans; external hosting has separate credentials and costs.Not specified

Pricing, Teams & Security

6 specifications +
SpecificationOpenAI CodexSecond model
Free Plan / TrialFree access is included with limited model/client availability; Free and Go currently list GPT-6 Luna Standard in desktop, subject to rollout. A universal paid-plan trial duration is not disclosed.Not specified
Usage Limits / Extra UsageAllowance depends on model, reasoning, speed and task. Plus/Standard Business publish 5-hour estimates; weekly limits may apply. Pro currently has no 5-hour limit. Extra credits and API billing are separate.Not specified
Team AdministrationBusiness/Enterprise provide workspace administration; managed configuration controls Codex access, permissions, models and rollout. Enterprise adds broader governance and audit capabilities.Not specified
Code Privacy & Data RetentionCloud inference processes supplied context unless a local provider is configured. Business/API data is not used for training by default. Retention varies by service, plan and controls; API abuse-monitoring logs are generally retained up to 30 days, with exceptions and eligible ZDR. No universal Codex retention duration is disclosed.Not specified
Self-HostingLocal Codex CLI/app-server can run on infrastructure you manage, including local-model setups. This does not self-host the managed Codex Cloud service; hosted-service parity is not disclosed.Not specified
SSO / Enterprise SecurityBusiness includes SAML SSO and MFA. Enterprise/Edu add controls such as SCIM, role-based access, audit/compliance access and retention/residency settings; exact scope depends on plan.Not specified

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