Anthropic: Claude Opus 4.8 (Fast)

Anthropic: Claude Opus 4.8 (Fast)

Anthropic · pinned anthropic/claude-opus-4.8-fast

Reproducibility

gateway_id:: anthropic/claude-opus-4.8-fast
version_pinned:: anthropic/claude-opus-4.8-fast
released_at:: 27 May 2026
last run:: 01 Jun 2026
temperature:: 0
top_p:: 1
seed:: unsupported
prompt_template_hash:: 5a732017979c

Score (WFT + Prompt): 35 / 40
Average of WFT and Prompt
WFT score: 33 / 40
66/80 raw
Prompt score: 36 / 40
Mean 0.895
WFT mean: 0.821
WFT stdev (sigma): 0.006
Result: Pass

Change from previous run

No earlier published WFT run yet.

Confidence interval

30.7-34.6

95% interval around 32.8 / 40, based on 197/240 answers.

Strong domains

WFT-Basis82% · 197/240

Weak domains

WFT-Basis82% · 197/240

Latest WFT run error types

Aggregated error categories only; no question text or raw model output.

Refusal rate: 0%
Parser errors: 0%

Type	Count	Rate
Parserfouten	0	0%
Refusals	0	0%
Timeouts	0	0%
Retry releases	0	0%
Failed jobs	0	0%

Score by CDFD learning objective

Objective	Correct	Total	%
WFT-Basis	197	240	82% above pass threshold

Score by advice product

Auto

95%

Reis

93%

Rechtsbijstand

90%

Woning

90%

Zorg

87%

AVP

85%

Advice product	Reviews	%
Auto	1	95% above pass threshold
Reis	2	93% above pass threshold
Rechtsbijstand	1	90% above pass threshold
Woning	3	90% above pass threshold
Zorg	3	87% above pass threshold
AVP	1	85% above pass threshold

Run history

Date	WFT score	Run
01 Jun 2026	33 / 40	combined

Model version policy

These fields show which model route, parser and dataset belong to this score.

Field	Value
Provider	Anthropic
Gateway	anthropic/claude-opus-4.8-fast
Exact API model name	anthropic/claude-opus-4.8-fast
Provider release date	27 May 2026
Test date	01 Jun 2026
Endpointtype	router
Model alias or snapshot	anthropic/claude-opus-4.8-fast
Provider can silently change	onbekend
Seed supported	No
Tools disabled	Yes
System prompt	Empty