CATCH #2231
DETECTED OCT 21, 2026 22:19 UTC
THE CATCHscore 10/10
EXHIBIT 2231 · FLASH
Oct 21, 2026 22:19 UTC
pypi
anthropic
Anthropic's Python SDK v2.1.0 hints at new 'claude-opus-4-8' and 'claude-haiku-4-5' model IDs, along with a 'beta' messages API for streaming and environment features.
✓ VERIFIED — BEAT THE ANNOUNCEMENT BY 26.6H · AUTO-VERIFIED AGAINST ANTHROPIC NEWS
READY TO POST:
anthropic's latest python sdk (v2.1.0) just dropped, and it includes references to new model ids: 'claude-opus-4-8' and 'claude-haiku-4-5'. could these be next?
peeking into the new anthropic python sdk 2.1.0, there are 'beta' api calls for messages.stream and environments. looks like some interesting new features are on the way, potentially including unannounced models like 'claude-opus-4-8' and 'claude-haiku-4-5'.
EVIDENCE — the receipts
anthropic 2.0.0 -> 2.1.0: +155 strings, -686 strings, 64 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] (3)
+ py
client = Anthropic(middleware=[BetaRefusalFallbackMiddleware([{"model": "claude-opus-4-8"}])])
state = BetaFallbackState()
with state:
message = client.beta.messages.create(**params)
+ py
with client.beta.messages.stream(...) as stream:
for chunk in stream:
...
+ py
client.beta.environments.work.worker(environment_id=..., environment_key=...)
[sentence] (64)
+ 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)
+ py
with client.beta.messages.stream(...) as stream:
for chunk in stream:
...
+ py
client.beta.environments.work.worker(environment_id=..., environment_key=...)
+ ) whose option is unset has the client's own, so it reads none of them either.
"""
class RequestOptions(TypedDict, total=False):
headers: Headers
max_retries: int
timeout: float | Timeout | None
params: Query
extra_json: AnyMapping
idempotency_key: str
"""Deprecated: th
+ , reads none of them, and what the option leaves out has its default. A copy of a client
caught by the 20-minute sweep ·
the live wire · all receipts