BELLISTE / AI COMPARISON

Compare AI models

Choose two models from the same AI category to compare equivalent plans, capabilities and technical details.

First modelvsSecond model

Claude Code

86%

OpenAI Codex

88%

Estimated Belliste score, based on the available capabilities, quality, features and pricing information. It is an indicative profile estimate, not an independent benchmark.

How this profile estimate is calculated

Capabilities contribute 35%, quality wording 30%, listed features 20%, and pricing 15% when available. When capability fields are absent, specialization breadth supplies a 25% fallback. Missing categories are omitted and the remaining weights are rescaled. The estimate uses each model’s own published profile; it does not measure answer accuracy or replace a hands-on test.

OverviewClaude CodeOpenAI Codex

PricePro $20/month billed monthly · $200/year prepaid (about $16.67/month) · API access billed separately by usage.Free $0/month · Go $8/month · Plus $20/month; monthly USD subscription prices. API usage is billed separately.

Free planClaude Free does not include Claude Code. No standard Claude Code free-trial duration is disclosed; promotional offers may differ.Free 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 plans

Overview & Compatibility

9 specifications

SpecificationClaude CodeOpenAI Codex

Starting PricePro $20/month billed monthly · $200/year prepaid (about $16.67/month) · API access billed separately by usage.Free $0/month · Go $8/month · Plus $20/month; monthly USD subscription prices. API usage is billed separately.

Tool TypeCoding Agent / IDE Assistant; available through CLI, editor integrations, desktop and web.Coding Agent / IDE Assistant; local development and cloud task workflows.

Primary Use CaseImplement features, investigate bugs, refactor repositories and automate development work with an agent that can edit files and run tools.Implement features, investigate bugs, review changes and automate repository maintenance.

Best ForDevelopers and engineering teams working on existing repositories, multi-file changes and repeatable coding workflows.Individual developers and engineering teams working with repositories, tests and code review.

Access MethodsCLI · VS Code extension · JetBrains plugin · Claude desktop Code tab · Web; mobile access to cloud sessions.Desktop app · CLI · IDE extension/integrations · Web/cloud; mobile cloud access depends on plan and client.

Supported Operating SystemsCLI: Windows, macOS, Linux and WSL. Desktop availability depends on OS; the Linux desktop app is beta. Native Windows and WSL differ in sandbox support.Windows, macOS and Linux; CLI also runs in WSL. Installation, sandboxing and desktop capabilities differ by OS.

Supported IDEs & EditorsVS Code and compatible editors including Cursor; JetBrains IDEs through the Claude Code plugin. Other editors can run the CLI in an integrated terminal.VS Code, VS Code Insiders, Cursor and compatible editors; Xcode and JetBrains offer separate integrations.

Programming LanguagesWorks across source languages using repository files and installed development tools. An exhaustive supported-language list and equal capability across languages are not disclosed.Works across programming languages through source files and installed project tools. No exhaustive language-by-language compatibility guarantee is disclosed.

Framework SupportCan work with a project’s framework and tooling. No exhaustive official framework compatibility matrix or framework-specific support guarantee is disclosed.Uses the project’s framework, dependencies and build tools. A complete framework certification/support matrix is not disclosed.

Coding Capabilities

11 specifications

SpecificationClaude CodeOpenAI Codex

Code CompletionTraditional as-you-type inline code autocomplete: Not disclosed. Documented editor features include prompted code changes and inline diff review.Traditional as-you-type inline code autocomplete: Not disclosed. Codex documents prompted coding, editor-context input and diff review.

Code GenerationGenerates source code, new files and feature implementations from natural-language instructions.Generates code and files from instructions in an existing repository or new project.

Inline Code EditingSelected code and line ranges can be sent from the editor for prompted changes; proposed edits appear in an inline or side-by-side diff for review. This differs from as-you-type autocomplete.Uses selected editor code and open files as context for requested changes; edits can be reviewed beside the source.

Multi-File EditingCoordinates changes across multiple files in a repository; results should be checked against project tests.Can change multiple files in one repository task and present the resulting diff for review.

Code ExplanationExplains functions, project structure and execution paths using repository context.Explains repository structure, functions and unfamiliar implementation details using accessible files.

RefactoringRefactors existing code and updates dependent call sites; can run project checks after changes.Refactors existing code using project instructions and can verify the result with available checks.

Debugging AssistanceInvestigates errors, searches relevant code and proposes or implements fixes using logs and project tools.Investigates error reports, traces code paths and implements fixes; available logs and tests improve verification.

Test GenerationCreates tests for functions and modules, including edge cases, using the project test framework.

Agents & Execution

9 specifications

SpecificationClaude CodeOpenAI Codex

Agent Mode & PlanningAgentic loop gathers context, makes changes and checks results; Plan Mode separates investigation/planning from implementation.Agent can inspect, plan, edit and verify a task. Planning and execution follow the selected mode and permission policy.

Terminal Command ExecutionRuns shell commands, builds and development tools, subject to permission rules and tools installed in the execution environment.Runs shell commands, builds and installed development tools within the allowed filesystem and network scope.

Automated Test ExecutionRuns the project’s installed test tools, reads failures and can iterate on fixes. Test infrastructure and dependencies must be available.Runs available test suites, reads failures and can iterate on fixes; dependencies and test infrastructure must be configured.

Browser InteractionInteractive Chrome integration can navigate pages, enter forms, inspect an app and help debug browser behavior; requires the supported browser setup.Built-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.

Background / Cloud AgentsBackground local work and cloud sessions are supported. Hosted cloud tasks continue independently of the local laptop and share account usage limits.Cloud tasks run in isolated workspaces and continue while the local computer sleeps. Local background work depends on the host remaining available.

Parallel Agent TasksParallel subagents and concurrent sessions are supported; available capacity and consumption depend on the plan and runtime.Supports parallel subagents and separate concurrent tasks; Git worktrees help isolate repository changes. Parallel work increases usage.

Human Approval ControlsConfigurable permission modes and allow/deny rules. Manual mode requests file-edit and command approval; Plan mode supports reviewing the approach before implementation.

AI Models & Codebase Context

8 specifications

SpecificationClaude CodeOpenAI Codex

Supported AI ModelsAnthropic API aliases currently resolve to Opus 5.5, Sonnet 5.5 and Haiku 5.5. Fable 5.1 and Fable 5 can be selected where eligible. Provider, plan and CLI version affect access.GPT-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.

Model SelectionManual model picker and /model command; configured defaults, fallback chains and opusplan can switch models automatically.Configurable defaults plus manual model/reasoning selection via the picker, /model or --model. Available settings depend on client and workspace policy.

Bring Your Own API KeySupports an Anthropic API key and credentials for supported cloud providers. API/provider usage is billed under the corresponding account.Supports 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.

Local Model SupportAnthropic does not support routing Claude Code to non-Claude models through gateways. Unofficial local-model adapters are outside official support; running the CLI locally does not make Claude inference local.CLI OSS mode supports local providers such as Ollama and LM Studio via --oss. Hardware, model tool support and feature compatibility vary.

Codebase Context & IndexingBuilds repository context through file reads, filename/content search and optional code-intelligence plugins. A separate persistent semantic-index specification is not disclosed.Reads and searches accessible repository files, uses editor selections and project guidance. A universal persistent semantic-index specification is not disclosed.

Context WindowModel/provider dependent: current Fable, Opus 5.5, Sonnet 5.5 and Haiku 5.5 support 1M tokens. Older variants can use 200K or an eligible [1m] option; plan settings and compaction affect usable context.

Developer Workflow & Integrations

5 specifications

SpecificationClaude CodeOpenAI Codex

Git & Pull RequestsLocal Git branches, diffs and commits; PR creation with authenticated tooling. Cloud repository cloning and PR creation require GitHub; other remotes have cloud limitations.Local Git diff, branch/worktree and change-review workflows. Authenticated Git tools/integrations can prepare and create pull requests; remote-provider permissions apply.

MCP & External IntegrationsMCP servers extend tool access; integrations include editor plugins, GitHub Actions, GitLab CI and Slack. Third-party accounts and permissions may be required.MCP supports external tools and data sources. Plugins and integrations can connect GitHub, GitLab beta, Slack, Linear and other services; availability and permissions differ.

Web SearchBuilt-in web search and page fetching for documentation, error research and other development context; network and organization policies apply.Web search is supported, with availability and network behavior determined by client, configuration and workspace policy.

API / SDK AccessProgrammatic use through the Claude Agent SDK and non-interactive CLI; SDK documentation is provided for TypeScript and Python. API/provider billing is separate from subscription allowances.Codex SDKs for TypeScript and Python, app-server for custom clients, and codex exec for automation/CI. Authentication and usage billing follow the chosen runtime.

Deployment SupportRuns user-configured deployment scripts, provider CLIs or MCP tools with permission; no hosting service is included. Deployment credentials and infrastructure costs depend on the chosen provider.Can 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.

Pricing, Teams & Security

6 specifications

SpecificationClaude CodeOpenAI Codex

Free Plan / TrialClaude Free does not include Claude Code. No standard Claude Code free-trial duration is disclosed; promotional offers may differ.Free 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.

Usage Limits / Extra UsageSubscription allowances vary by plan, model and task; usage is shared with Claude. Team/Enterprise seats have rolling 5-hour and weekly allowances. Optional usage credits and API usage are billed separately.Allowance 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.

Team AdministrationTeam/Enterprise support centralized billing, member management and organization settings; Enterprise adds role-based controls and compliance capabilities.Business/Enterprise provide workspace administration; managed configuration controls Codex access, permissions, models and rollout. Enterprise adds broader governance and audit capabilities.

Code Privacy & Data RetentionRemote inference processes selected context. Consumer training follows the user setting: retention 30 days when disabled, 5 years when enabled. Commercial data is not used for training by default; standard retention 30 days. Eligible Enterprise organizations can request ZDR; exceptions apply.Cloud 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.

Self-HostingSelf-hosted execution environments are public beta for Team/Enterprise and require admin enablement. They do not provide offline Claude model inference; cloud inference and feature restrictions still apply.Local 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.