Greptile Summary

This PR adds support for four new GPT-5 model variants to the Sim platform: gpt-5, gpt-5-mini, gpt-5-nano, and gpt-5-chat-latest. The changes span three files across the codebase:

Core Implementation (apps/sim/providers/models.ts): Four new model definitions are added to the OpenAI provider configuration with comprehensive pricing structures and capabilities. The pricing follows a logical tier system - premium models (gpt-5 and gpt-5-chat-latest) are priced at $10/$40 per million tokens, mid-tier (gpt-5-mini) at $1/$4, and economy (gpt-5-nano) at $0.2/$0.8. All models include cached input pricing at 50% of regular input costs, temperature control (0-2 range), and tool usage capabilities, following established patterns in the existing codebase.

Documentation Updates: The changes include updates to two documentation files. The agent block documentation (apps/docs/content/docs/blocks/agent.mdx) adds "GPT-5" to the list of available OpenAI models, positioning it first in the list. Additionally, one example in the data structure documentation (apps/docs/content/docs/connections/data-structure.mdx) updates a model reference from gpt-4o to gpt-5 in an Evaluator block output example.

Integration with Existing Architecture: The new models integrate seamlessly with the existing provider system through the PROVIDER_DEFINITIONS structure, which automatically propagates these models throughout the application via utility functions. This maintains the single source of truth pattern established in the codebase.

PR Description Notes:

• The PR description mentions "gpt-5-chat" but the actual implementation uses "gpt-5-chat-latest"
• Documentation inconsistency exists where only generic "GPT-5" is mentioned rather than listing all four specific model variants

Confidence score: 1/5

• This PR poses significant risks as it adds support for GPT-5 models that do not currently exist in OpenAI's API, which will cause runtime failures when users attempt to use these models
• Score reflects the fundamental issue that these are speculative/hypothetical models that will break functionality when selected by users
• Pay close attention to apps/sim/providers/models.ts as it defines non-existent models that will cause API calls to fail

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