Completions

Create a Text Completion

client.completions.create(, ?): Completion { id, completion, model, 2 more } | Stream<Completion { id, completion, model, 2 more } >

POST/v1/complete

ModelsExpand Collapse

Completion { id, completion, model, 2 more }

id: string

Unique object identifier.

The format and length of IDs may change over time.

completion: string

The resulting completion up to and excluding the stop sequences.

model: Model

The model that will complete your prompt.

See models for additional details and options.

Accepts one of the following:

"claude-opus-4-6" | "claude-sonnet-4-6" | "claude-haiku-4-5" | 12 more

"claude-opus-4-6"

Most intelligent model for building agents and coding

"claude-sonnet-4-6"

Best combination of speed and intelligence

"claude-haiku-4-5"

Fastest model with near-frontier intelligence

"claude-haiku-4-5-20251001"

Fastest model with near-frontier intelligence

"claude-opus-4-5"

Premium model combining maximum intelligence with practical performance

"claude-opus-4-5-20251101"

Premium model combining maximum intelligence with practical performance

"claude-sonnet-4-5"

High-performance model for agents and coding

"claude-sonnet-4-5-20250929"

High-performance model for agents and coding

"claude-opus-4-1"

Exceptional model for specialized complex tasks

"claude-opus-4-1-20250805"

Exceptional model for specialized complex tasks

"claude-opus-4-0"

Powerful model for complex tasks

"claude-opus-4-20250514"

Powerful model for complex tasks

"claude-sonnet-4-0"

High-performance model with extended thinking

"claude-sonnet-4-20250514"

High-performance model with extended thinking

"claude-3-haiku-20240307"

Fast and cost-effective model

(string & {})

stop_reason: string | null

The reason that we stopped.

This may be one the following values:

"stop_sequence": we reached a stop sequence — either provided by you via the stop_sequences parameter, or a stop sequence built into the model
"max_tokens": we exceeded max_tokens_to_sample or the model's maximum

type: "completion"

Object type.

For Text Completions, this is always "completion".

Completions

Create a Text Completion

client.completions.create(, ?): Completion { id, completion, model, 2 more } | Stream<Completion { id, completion, model, 2 more } >

POST/v1/complete

ModelsExpand Collapse

Completion { id, completion, model, 2 more }

id: string

Unique object identifier.

The format and length of IDs may change over time.

completion: string

The resulting completion up to and excluding the stop sequences.

model: Model

The model that will complete your prompt.

See models for additional details and options.

Accepts one of the following:

"claude-opus-4-6" | "claude-sonnet-4-6" | "claude-haiku-4-5" | 12 more

"claude-opus-4-6"

Most intelligent model for building agents and coding

"claude-sonnet-4-6"

Best combination of speed and intelligence

"claude-haiku-4-5"

Fastest model with near-frontier intelligence

"claude-haiku-4-5-20251001"

Fastest model with near-frontier intelligence

"claude-opus-4-5"

Premium model combining maximum intelligence with practical performance

"claude-opus-4-5-20251101"

Premium model combining maximum intelligence with practical performance

"claude-sonnet-4-5"

High-performance model for agents and coding

"claude-sonnet-4-5-20250929"

High-performance model for agents and coding

"claude-opus-4-1"

Exceptional model for specialized complex tasks

"claude-opus-4-1-20250805"

Exceptional model for specialized complex tasks

"claude-opus-4-0"

Powerful model for complex tasks

"claude-opus-4-20250514"

Powerful model for complex tasks

"claude-sonnet-4-0"

High-performance model with extended thinking

"claude-sonnet-4-20250514"

High-performance model with extended thinking

"claude-3-haiku-20240307"

Fast and cost-effective model

(string & {})

stop_reason: string | null

The reason that we stopped.

This may be one the following values:

"stop_sequence": we reached a stop sequence — either provided by you via the stop_sequences parameter, or a stop sequence built into the model
"max_tokens": we exceeded max_tokens_to_sample or the model's maximum

type: "completion"

Object type.

For Text Completions, this is always "completion".