YeonGyu-Kim
b9a8ffec51
Anthropic made the 1M context window GA for Opus 4.6, Sonnet 4.6, and 4.7 models on March 13, 2026 — no beta header required. The resolver was still falling back to 200K when no modelContextLimitsCache entry existed, causing premature compaction and over-truncation. Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
46 lines
1.6 KiB
TypeScript
46 lines
1.6 KiB
TypeScript
import process from "node:process"
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const DEFAULT_ANTHROPIC_ACTUAL_LIMIT = 200_000
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const ANTHROPIC_GA_1M_LIMIT = 1_000_000
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export type ContextLimitModelCacheState = {
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anthropicContext1MEnabled: boolean
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modelContextLimitsCache?: Map<string, number>
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}
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function isAnthropicProvider(providerID: string): boolean {
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const normalized = providerID.toLowerCase()
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return normalized === "anthropic" || normalized === "google-vertex-anthropic" || normalized === "aws-bedrock-anthropic"
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}
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function getAnthropicActualLimit(modelCacheState?: ContextLimitModelCacheState): number {
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return (modelCacheState?.anthropicContext1MEnabled ?? false) ||
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process.env.ANTHROPIC_1M_CONTEXT === "true" ||
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process.env.VERTEX_ANTHROPIC_1M_CONTEXT === "true"
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? ANTHROPIC_GA_1M_LIMIT
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: DEFAULT_ANTHROPIC_ACTUAL_LIMIT
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}
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function hasGA1MContext(modelID: string): boolean {
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return /^claude-(opus|sonnet)-4(?:-|\.)(?:6|7)(?:-high)?$/.test(modelID)
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}
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export function resolveActualContextLimit(
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providerID: string,
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modelID: string,
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modelCacheState?: ContextLimitModelCacheState,
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): number | null {
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if (isAnthropicProvider(providerID)) {
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const explicit1M = getAnthropicActualLimit(modelCacheState)
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if (explicit1M === ANTHROPIC_GA_1M_LIMIT) return explicit1M
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const cachedLimit = modelCacheState?.modelContextLimitsCache?.get(`${providerID}/${modelID}`)
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if (cachedLimit && hasGA1MContext(modelID)) return cachedLimit
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if (hasGA1MContext(modelID)) return ANTHROPIC_GA_1M_LIMIT
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return DEFAULT_ANTHROPIC_ACTUAL_LIMIT
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}
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return modelCacheState?.modelContextLimitsCache?.get(`${providerID}/${modelID}`) ?? null
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}
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