Who contributed to FastAPI & Pydantic on July 28, 2026?

5 developers shipped this update, including tiangolo, dependabot, chinesepowered, Dhruva Kumar, and Victorien.

What were the notable FastAPI & Pydantic updates?

👷 Add OpenAPI dependency benchmarks, ⚡️ Avoid flattening dependencies for OpenAPI, and ♻️ Update the lru_cache limit for dependencies to account for large apps.

FastAPI & Pydantic

FastAPI and the Pydantic + SQLModel async-Python stack

Pick a date

Topics: Python Full archive →

The Wire · Showcase

FASTAPI DITCHES DEPENDENCY FLATTENING, CUTS OPENAPI GENERATION BLOAT

By RepoJournal · Filed 07:00 UTC on July 28, 2026 · About FastAPI & Pydantic

5 people shipped this

tiangolo @tiangolo 5 cited

Dhruva Kumar @dhruvatr 2 cited

chinesepowered @chinesepowered 1 cited

Victorien @Viicos 1 cited

dependabot @dependabot

FastAPI is ripping out the dependency tree flattening that bloated OpenAPI schema generation, replacing it with direct graph traversal that preserves order and skips duplicates without the synthetic overhead.

Tiangolo shipped the one-two punch this cycle: benchmarks first [1], then the refactor [2]. The old code built massive synthetic dependency trees just to extract parameter and security metadata for OpenAPI, then threw them away. The new approach walks each route's dependency graph directly, collecting only what OpenAPI actually needs. Duplicate skipping and OAuth scope inheritance work without the extra object churn. On the back of this, the lru_cache for dependency resolution bumped up [3] to handle apps with more than 1024 dependencies, a problem real users hit. Memory profiling infrastructure landed too [4], so regressions get caught early. Over in SQLModel, the latest-changes action upgraded [5] to 0.7.1, cleaning up redundant workflow config. Pydantic's crew fixed URL comparison semantics [6] to return NotImplemented instead of False when comparing different types, which was breaking sort order logic. Annotation access in Python 3.13 got patched [8], and grammar fixes landed in ValidationError JSON [7], [9].

Action items

→ Watch FastAPI 0.115+ for the OpenAPI generation speedup; profile your app if you have complex dependency chains fastapi/fastapi [monitor]
→ Review Pydantic URL comparisons if you rely on sort order or ordering logic with different URL types pydantic/pydantic [plan]
→ Update SQLModel workflows to use latest-changes 0.7.1 if you maintain CI release automation tiangolo/sqlmodel [plan]

References

[1] 👷 Add OpenAPI dependency benchmarks ↗ fastapi/fastapi
[2] ⚡️ Avoid flattening dependencies for OpenAPI ↗ fastapi/fastapi
[3] ♻️ Update the lru_cache limit for dependencies to account for large apps ↗ fastapi/fastapi
[4] 👷 Add new memory benchmark ↗ fastapi/fastapi
[5] ⬆️ Upgrade latest-changes to 0.7.1 ↗ tiangolo/sqlmodel
[6] Return `NotImplemented` from URL ordering comparisons with foreign types ↗ pydantic/pydantic
[7] Fix grammar in ValidationError JSON description (#13531) pydantic/pydantic
[8] Fix access of annotations in `safe_get_annotations()` in Python <= 3.13 (#13521) pydantic/pydantic
[9] Fix grammar in ValidationError JSON description ↗ pydantic/pydantic

Quick answers

What shipped in FastAPI & Pydantic on July 28, 2026?: FastAPI is ripping out the dependency tree flattening that bloated OpenAPI schema generation, replacing it with direct graph traversal that preserves order and skips duplicates without the synthetic overhead. In total, 22 commits, 23 pull requests, and 7 releases landed.
Who contributed to FastAPI & Pydantic on July 28, 2026?: 5 developers shipped this update, including tiangolo, dependabot, chinesepowered, Dhruva Kumar, and Victorien.
What were the notable FastAPI & Pydantic updates?: 👷 Add OpenAPI dependency benchmarks, ⚡️ Avoid flattening dependencies for OpenAPI, and ♻️ Update the lru_cache limit for dependencies to account for large apps.

FASTAPI FIXES STREAMING SCHEMA CHAOS ACROSS 4 CRITICAL BUGS

FastAPI shipped fixes for four streaming and schema generation bugs that were silently breaking OpenAPI contracts and response validation across SSE, JSONL, and typed iterables.

python 43 shipped 1-min read

FastAPI & Pydantic 4 days ago

FASTAPI 0.140.0 CUTS MEMORY OVERHEAD IN DEPENDENCIES

FastAPI shipped a memory optimization that simplifies how dependencies are processed, backed by months of community analysis and benchmarking.

python 9 shipped 1-min read

FastAPI & Pydantic 5 days ago

FASTAPI AND SQLMODEL STANDARDIZE ON UV, PYDANTIC DOCS BLOCKED ON SETTINGS DRIFT

Tiangolo shipped Library Skills documentation across FastAPI and SQLModel while pivoting both projects toward uv as the default package manager, but Pydantic's docs build is failing due to version mismatch in pydantic-settings.

python 10 shipped 1-min read

FastAPI & Pydantic 6 days ago

SQLMODEL FIXES TERMYNAL SCROLL JAR ACROSS DOCS

Interactive code examples in SQLModel documentation no longer hijack your scroll position when you click the restart or fast-forward controls.

python 2 shipped 1-min read

Elsewhere on the wire

AI Agents about 3 hours ago

LANGCHAIN CORES SHIP, ANTHROPIC THINKING BLOCKS FIXED, OPENHANDS TIGHTENS WEBSOCKET AUTH

LangChain released two core packages with critical fixes for streaming stability and environment variable handling, while OpenHands closed a security gap that left WebSocket connections unprotected.

ai-agents 119 shipped 1-min read

Local LLMs about 3 hours ago

OLLAMA RIPS OUT IMAGE GENERATION, LLAMA.CPP SHIPS SPECULATIVE DECODING

Ollama removed its entire MLX image generation pipeline overnight, while llama.cpp landed DSpark speculative decoding and fixed a critical SYCL memory bug affecting Arc GPUs.

+11

llms 239 shipped 2-min read

@CachyOS about 4 hours ago

KERNEL SCHEDULER UPDATES ACROSS BORE AND SCX TOOLING

CachyOS shipped BORE 6.8.0 patches across two kernel series while upgrading its sched-ext ecosystem in parallel, signaling major tuning work ahead.

infra 83 shipped 1-min read

Elixir & Phoenix about 4 hours ago

ELIXIR TIGHTENS ERROR HANDLING ACROSS DATE, ECTO, AND IEXHELPERS

Date.range now surfaces ArgumentError instead of Protocol.UndefinedError when passed invalid step values, catching a class of bugs that silently fail in production code.