OpenAI Python SDK 3.35.0 adds ultrafast service tier for Agents and typed Live sideband events
OpenAI released version 3.35.0 of its Python SDK on October 17, 2026. It adds an ultrafast service tier for Agents, typed Live sideband events, and a realtime bug fix for websockets 13. Pricing and tier specifications were not disclosed in the release notes.
OpenAI shipped version 3.35.0 of its Python SDK on October 17, 2026, adding an "ultrafast" service tier for Agents and typed events for Live sideband connections. The release also fixes a byte-receive bug in the realtime client when it runs on websockets 13. It is a client library update, not a new model.
What changed
The release notes list two features and one bug fix, each tied to a pull request in the openai/openai-python repository.
Features
- Ultrafast service tier for Agents (#4101). The SDK now exposes an
ultrafastservice tier for Agents. The release notes do not state the tier's latency targets, pricing, rate limits, supported models, or availability. - Typed Live sideband events (#4099). The SDK adds typed definitions for Live sideband events. The notes do not describe the event schema or which event types are included. Typed events generally mean developers get static type checking and editor autocompletion when handling them, instead of working with untyped payloads.
Bug fix
- Realtime: byte receives with websockets 13 (#4098). The fix preserves byte receives when the realtime client is used with version 13 of the
websocketslibrary. The notes do not say what the failure looked like before the fix.
Release details
| Item | Detail |
|---|---|
| Package | openai-python |
| Version | 3.35.0 (previous: 3.34.0) |
| Release date | 2026-10-17 |
| Pricing | Not disclosed |
| New model | None |
The full diff is available in the v3.34.0...v3.35.0 comparison.
What is not confirmed
The changelog is limited to commit-level summaries. It does not say whether the ultrafast tier is generally available on the API or gated to specific accounts. It does not say how the tier is priced relative to existing tiers, or what "ultrafast" means in measurable terms. Developers should check OpenAI's API documentation before relying on the new parameter value.
What this means
The SDK change signals that OpenAI is building service-tier differentiation into its Agents product. Tiers are a common way to trade cost against latency, and an SDK-level enum is typically added alongside or after server-side support. Whether the tier is live for all users is unconfirmed.
The typed Live sideband events are a smaller but practical improvement. Teams building real-time or voice applications get safer handling of event streams, which reduces runtime errors from malformed or unexpected payloads.
The websockets 13 fix matters mainly for developers who have upgraded their dependency and use the realtime client. If you are on websockets 13 and have seen byte-handling problems, upgrading to 3.35.0 is the relevant step. Everyone else can treat this as a routine minor release.
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