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Model infoModelsSnapshot: 15 Oct 2026

01.AI / Yi / Yi proprietary language models

Yi-Large FC

Yi-Large-derived API variant with strengthened function calling.

Language models (LLMs)
historicalClosed weightsText generation
Official documentation (opens in a new tab)Reviewed 14 Oct 2026
5 of 16 specification fields collected
Context window32KSee specification notes below
Maximum outputNot collectedAwaiting source review
Input billingSee rates01.AI China API (historical)
Output billingSee ratesPublished units and conditions below

Specifications

Provider-documented facts. “Not collected” means we have not verified that field yet, not that the feature is unsupported.

Context / input limit
32KSource for Context / input limit (opens in a new tab)

December 5, 2024 China API context label; not an exact integer or a current service limit.

Maximum output
Not collected
Input modalities
TextSource for Input modalities (opens in a new tab)
Output modalities
TextSource for Output modalities (opens in a new tab)
Reasoning
Not collected
Tool calling
SupportedSource for Tool calling (opens in a new tab)

Dedicated strengthened function-calling variant.

Structured output
Not collected

Function-call arguments use JSON, but general strict-schema output support is unverified.

Streaming
SupportedSource for Streaming (opens in a new tab)

International chat contract and examples support SSE. Historical, suspended service.

Batch processing
Not collected
Fine-tuning
Not collected
Knowledge cutoff
Not collected
Release date
Not collected
Parameters
Not collected
Architecture
Not collected
Languages
Not collected
Context caching
Not collected

Access & pricing

Prices belong to an endpoint and billing tier. A provider listing does not guarantee access for every account or region.

01.AI China API (historical)

Provider source (opens in a new tab)
API model ID
yi-large-fc
Access
Historical direct-model catalog; public China API service has stopped. No authenticated inference or API-key provisioning performed.
Regions
Host-specific historical service; no current availability or residency guarantee inferred.
context
32KSource for context (opens in a new tab)
API endpoint URL
POST https://api.lingyiwanwu.com/v1/chat/completionsSource for API endpoint URL (opens in a new tab)

Prices retain their published currencies and billing units below.

Published billing units · original currency · observed 14 Oct 2026
CategoryUsageRateUnit
Historical text inferenceInput1CN¥20.001M tokens
Historical text inferenceOutput1CN¥20.001M tokens

Rate conditions

  1. Price in the December 5, 2024 archive, charged on input plus output tokens; conversation history is billable input. Not the final pre-shutdown price and not a current offer. No currency conversion.
Pricing source (opens in a new tab)

Data & enterprise terms

Retention, training use, regional processing and enterprise terms have not been summarized for this endpoint.

01.AI international API (suspended)

Provider source (opens in a new tab)
API model ID
yi-large-fc
Access
International homepage announces API suspension starting August 25 and directs users to the China site. The year is not stated; no exact suspension date is invented. The China alternative is now shut down.
Regions
Host-specific historical service; no current availability or residency guarantee inferred.
context
32KSource for context (opens in a new tab)
API endpoint URL
POST https://api.01.ai/v1/chat/completionsSource for API endpoint URL (opens in a new tab)
outputBudget
Input plus output must fit the model context; max_tokens is caller-controlledSource for outputBudget (opens in a new tab)

Example values such as 1,000 or 1,024 are not advertised maximum output limits.

Prices retain their published currencies and billing units below.

Published billing units · original currency · observed 14 Oct 2026
CategoryUsageRateUnit
Historical text inferenceInput1$3.001M tokens
Historical text inferenceOutput1$3.001M tokens

Rate conditions

  1. International documentation still displays this price, but the homepage announces service suspension. Historical reference only, not a current purchasable rate. Input and output are separately priced at the same listed amount.
Pricing source (opens in a new tab)

Data & enterprise terms

Retention, training use, regional processing and enterprise terms have not been summarized for this endpoint.

Caching

Caching can reuse earlier input processing. Availability, lifetime and billing depend on the endpoint. A cache hit still generates a new response.

01 / INITIAL INPUTProcess & retain

The system processes eligible input and retains reusable state.

02 / LATER REQUESTCheck available state

Reuse depends on matching input, session state and the cache policy.

03 / CACHE HITReuse & generate

Reusing state can reduce repeated work. Any charges follow the billing rules below.

01.AI China API (historical)

yi-large-fc
Not verified

No model-specific API prompt-cache contract verified.

How it works
Not collected

No model-specific API prompt-cache contract verified.

Minimum reusable input
Not collected

No model-specific API prompt-cache contract verified.

Lifetime & refresh
Not collected

No model-specific API prompt-cache contract verified.

How to enable it
Not collected

No model-specific API prompt-cache contract verified.

Usage fields
Not collected

No model-specific API prompt-cache contract verified.

Billing rules
Not collected

No model-specific API prompt-cache contract verified.

Limits & data boundaries
Not collected

No model-specific API prompt-cache contract verified.

No verified cache rate for this endpoint. An empty rate is not a zero charge.

01.AI international API (suspended)

yi-large-fc
Not verified

No model-specific API prompt-cache contract verified.

How it works
Not collected

No model-specific API prompt-cache contract verified.

Minimum reusable input
Not collected

No model-specific API prompt-cache contract verified.

Lifetime & refresh
Not collected

No model-specific API prompt-cache contract verified.

How to enable it
Not collected

No model-specific API prompt-cache contract verified.

Usage fields
Not collected

No model-specific API prompt-cache contract verified.

Billing rules
Not collected

No model-specific API prompt-cache contract verified.

Limits & data boundaries
Not collected

No model-specific API prompt-cache contract verified.

No verified cache rate for this endpoint. An empty rate is not a zero charge.

What the measurements say

No benchmark observations have been added for this model. We do not turn a vendor description into a performance score.

Latency and throughput depend on the host, request size, reasoning settings and load. There is no measured speed or global usage figure in this record.

The record behind the model

Why it is included

Inferred for this named proprietary API/research variant from the developer’s release description and public weight inventory. Exact weights for this variant were not found. Public Yi, Yi-1.5, Yi-Coder and Yi-VL checkpoints remain excluded; API naming alone does not prove an independently trained base.

Classification evidence (opens in a new tab)

Lifecycle dates

China public API service stopped3 Sept 2026Source (opens in a new tab)

Sources reviewed