CATCH #1369
DETECTED SEP 15, 2026 15:19 UTC
THE CATCHscore 10/10
EXHIBIT 1369 · FLASH
Sep 15, 2026 15:19 UTC
pypi
anthropic
Anthropic's Python SDK v1.6.0 introduces new model IDs, beta features for messages, environments, and tools, and expands on streaming capabilities.
READY TO POST:
anthropic's latest python sdk (1.6.0) just dropped with some interesting beta features for messages, tool runners, and environments. definitely worth digging into if you're building on claude!
new model ids 'claude-opus-4-8' and 'claude-haiku-4-5' spotted in the anthropic 1.6.0 sdk. looks like some updates might be brewing on the model front!
EVIDENCE — the receipts
anthropic 1.5.0 -> 1.6.0: +532 strings, -489 strings, 114 interesting
[model_id] (2)
+ py
client = Anthropic(middleware=[BetaRefusalFallbackMiddleware([{"model": "claude-opus-4-8"}])])
state = BetaFallbackState()
with state:
message = client.beta.messages.create(**params)
+ python
with client.messages.stream(
model="claude-haiku-4-5",
max_tokens=1024,
messages=[{"role": "user", "content": "Hello!"}],
) as stream:
for text in stream.text_stream:
print(text, end="", flush=True)
[feature_flag] (12)
+ py
client = Anthropic(middleware=[BetaRefusalFallbackMiddleware([{"model": "claude-opus-4-8"}])])
state = BetaFallbackState()
with state:
message = client.beta.messages.create(**params)
+ Telemetry header naming the streaming surface (e.g. `beta.messages`).
+ client.beta.environments.work.poller
+ client.beta.environments.work.poller(...)
+ client.beta.environments.work.worker(...)
+ client.beta.messages.tool_runner
+ client.beta.messages.tool_runner(...)
+ client.beta.sessions.events.tool_runner
+ client.beta.sessions.events.tool_runner(...)
+ client.beta.skills.versions.download
+ py
with client.beta.messages.stream(...) as stream:
for chunk in stream:
...
+ py
client.beta.environments.work.worker(environment_id=..., environment_key=...)
[endpoint] (3)
+ Raised when the OIDC token exchange (`POST /v1/oauth/token`) fails.
+ base_url="http://evil/"
+ base_url="http://localhost:8080"
[sentence] (104)
+ py
client = Anthropic(middleware=[BetaRefusalFallbackMiddleware([{"model": "claude-opus-4-8"}])])
state = BetaFallbackState()
with state:
message = client.beta.messages.create(**params)
+ python
with client.messages.stream(
model="claude-haiku-4-5",
max_tokens=1024,
messages=[{"role": "user", "content": "Hello!"}],
) as stream:
for text in stream.text_stream:
print(text, end="", flush=True)
+ Telemet
caught by the 20-minute sweep ·
the live wire · all receipts