name = "Claude Opus 4.8"
description = "Top Claude Opus tier for the hardest reasoning, coding, and long-horizon agents"
family = "claude-opus"
release_date = "2026-05-28"
last_updated = "2026-05-28"
attachment = true
reasoning = true
temperature = false
tool_call = true
structured_output = true
knowledge = "2026-01"
open_weights = false

[[reasoning_options]]
type = "effort"
values = ["low", "medium", "high", "xhigh", "max"]

[cost]
input = 5
output = 25
cache_read = 0.5
cache_write = 6.25

[limit]
context = 1_000_000
output = 128_000

[modalities]
input = ["text", "image", "pdf"]
output = ["text"]

[experimental.modes.fast]
cost = { input = 10.00, output = 50.00, cache_read = 1.00, cache_write = 12.50 }
provider = { body = { speed = "fast" }, headers = { anthropic-beta = "fast-mode-2026-02-01" } }