anthropic
POST /v1/messagesClaude Opus 4.6 Fast
claude-opus-4.6-fastClaude Opus 4.7 Fast is the fast-mode variant of Claude Opus 4.7. OpenRouter describes it as having the same capabilities as Opus 4.7 with higher output speed at premium pricing. Opus 4.7 itself is optimized for coding, agents, computer use, and enterprise workflows, with a 1M context window and adaptive thinking. This variant is best described as the speed-optimized Opus 4.7 option for cases where Opus-level reasoning is required but output latency is the bottleneck.
Total Context
1Mtokens
Max Output
128Ktokens
Released
Feb 5, 2026
Modalities
Claude Opus 4.6 Fast Price
| Input Price | Output Price | Cache Read | Cache Create 5m |
|---|---|---|---|
| $30/M | $150/M | $3/M | $37.5/M |
Claude Opus 4.6 Fast API
Claude Opus 4.6 Fast Benchmark
46.5
/100
Artificial Analysis Intelligence Index
Artificial Analysis broad capability aggregate
Index score
47.6
/100
Artificial Analysis Coding Index
Artificial Analysis software task aggregate
Index score
Knowledge & Reasoning
GPQA
Advanced science problem solving
84%
HLE
Broad expert-level exam set
18.6%
Coding & Engineering
SciCode
Scientific coding challenges
45.7%
Terminal-Bench Hard
Hard terminal task execution
48.5%
Instruction Following & Agent Tasks
IFBench
Prompt constraint adherence
44.6%
AA-LCR
Long-context reasoning
58.3%
τ²-Bench
Agent workflow tasks
84.8%
Metrics sourced from Artificial Analysis
Frequently asked questions about Claude Opus 4.6 Fast
Understand what Claude Opus 4.6 Fast is, its best uses, distinguishing strengths, practical tradeoffs, and safe TokenHub integration guidance.
What is Claude Opus 4.6 Fast, and where does it fit in Anthropic’s model lineup?+
Claude Opus 4.6 Fast is Claude Opus 4.6 using an older Fast mode that Anthropic has deprecated in favor of newer Opus versions. Anthropic has deprecated this Fast mode, so treat it as a migration case rather than a default for new builds.
Which workloads are the best fit for Claude Opus 4.6 Fast?+
Best-fit scenarios include maintaining existing Fast-mode integrations, difficult software-engineering tasks, and professional document and decision analysis. Test representative inputs and define measurable acceptance criteria before production.
Why might a team select Claude Opus 4.6 Fast over a smaller or older model?+
Key strengths include higher output speed than standard mode, the underlying Opus model’s capability, and effective use of tools and function calls. This combination is especially useful for difficult software-engineering tasks.
What should be validated before relying on Claude Opus 4.6 Fast?+
Consider another model when the integration is not constrained to this deprecated mode, a supported newer Fast mode is available, or the premium Fast-mode cost is not justified by the latency target. Verify important factual, legal, financial, medical, or operational outputs with qualified human review.
What is the practical TokenHub setup guidance for Claude Opus 4.6 Fast?+
In TokenHub, select the exact model identifier displayed for Claude Opus 4.6 Fast, use the endpoint documented for your account, and authenticate with your TokenHub credentials. Use the TokenHub documentation to identify the supported migration target; do not assume this deprecated Fast slug will remain callable.
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