Claude Opus 4 8 Fast is listed in the o10 fulfillment catalog as of 2026-06-27. Anthropic publishes this model without a published context window in this snapshot. o10 lists Claude Opus 4 8 Fast on OpenRouter at routing band C3. API slug anthropic-claude-opus-4-8-fast. Verify list prices against the venue you call.
Last updated: 2026-06-27. Full catalog. Reference prices are dated snapshots. Compare total cost and measured task quality before choosing a route.
Claude Opus 4 8 Fast is a chat model from anthropic (slug: anthropic-claude-opus-4-8-fast). Pick Claude Opus 4 8 Fast when the eval floor needs Anthropic's flagship. It is the expensive Claude; do not pin it as a chat default.
Catalog snapshot 2026-06-27.
Pick Claude Opus 4 8 Fast when the eval floor needs Anthropic's flagship. It is the expensive Claude; do not pin it as a chat default. Claude Opus 4 8 Fast is the Opus line. Sonnet is the usual production default. If Sonnet clears the same use-case eval, stay on Sonnet.
Claude Opus 4 8 Fast is the Opus line. Sonnet is the usual production default. If Sonnet clears the same use-case eval, stay on Sonnet.
Claude Opus 4 8 Fast does not have published per-token pricing in the current gateway snapshot. See fulfillment hosts below for routing options.
Pricing unavailable in current snapshot.
Claude Opus 4 8 Fast is configured on OpenRouter. Known host IDs: openrouter: openrouter/anthropic/claude-opus-4.8-fast. This model is routable through o10 eval-gated routing.
Claude Opus 4 8 Fast context limits depend on the fulfillment host. Check the specifications table for endpoint-specific limits.
Claude Opus 4 8 Fast is classified at o10 routing band C3. Bands group models by cost tier and eval profile: C0 (economy), C1 (standard), C2 (capable), C3/C4 (frontier). Production routing is enabled for this slug.
Claude Opus 4 8 Fast is attributed to source provider anthropic in the o10 catalog. Fulfillment hosts (OpenRouter) supply API access; list pricing may differ by venue.
Claude Opus 4 8 Fast in the o10 unified catalog.
| Field | Value |
|---|---|
| o10 slug | `anthropic-claude-opus-4-8-fast` |
| Type | text |
| Band | C3 |
| Routable | Yes |
| Source provider | anthropic |
| Primary host | OpenRouter |
Upstream venues configured for Claude Opus 4 8 Fast.
| Host | Upstream model ID |
|---|---|
| openrouter | openrouter/anthropic/claude-opus-4.8-fast |
Eval-gated model selection for this slug.
o10 slug: anthropic-claude-opus-4-8-fast. Band: C3. Routable: yes.
See [/models/routing](/models/routing) for smart aliases (o10/auto, o10/frontier, o10/squad) and [/kyi](/kyi) for governance.
Fulfillment catalog 2026-06-27. Gateway pricing joined where slug match exists.
Claude Opus 4 8 Fast has no published per-token price in the current gateway snapshot. Use the fulfillment hosts table to identify available venues.
Context limits for Claude Opus 4 8 Fast vary by fulfillment host. See the specifications table on this page.
Claude Opus 4 8 Fast (anthropic-claude-opus-4-8-fast) is configured on: OpenRouter. Upstream model IDs are listed in the fulfillment routes section.
Yes. Claude Opus 4 8 Fast is routable at band C3. Send model: "anthropic-claude-opus-4-8-fast" or use an o10 smart routing alias.
Use o10 slug "anthropic-claude-opus-4-8-fast" in the model field. See /models/routing for smart aliases (o10/auto, o10/frontier, o10/squad).
o10 routes Claude Opus 4 8 Fast only when per-use-case evals clear at your quality floor. Band C3 indicates cost tier. See /kyi for governance and /models/routing for smart aliases.