Completions

Create a Text Completion

completions.create() -> Completion

POST/v1/complete

ModelsExpand Collapse

class Completion: …

id: str

Unique object identifier.

The format and length of IDs may change over time.

completion: str

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:

Literal["claude-opus-4-6", "claude-sonnet-4-6", "claude-haiku-4-5", 12 more]

The model that will complete your prompt.

See models for additional details and options.

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 - Deprecated: Will reach end-of-life on April 20th, 2026. Please migrate to claude-haiku-4-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.

Accepts one of the following:

"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

str

stop_reason: Optional[str]

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: Literal["completion"]

Object type.

For Text Completions, this is always "completion".

Completions

Create a Text Completion

completions.create() -> Completion

POST/v1/complete

ModelsExpand Collapse

class Completion: …

id: str

Unique object identifier.

The format and length of IDs may change over time.

completion: str

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:

Literal["claude-opus-4-6", "claude-sonnet-4-6", "claude-haiku-4-5", 12 more]

The model that will complete your prompt.

See models for additional details and options.

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 - Deprecated: Will reach end-of-life on April 20th, 2026. Please migrate to claude-haiku-4-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.

Accepts one of the following:

"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

str

stop_reason: Optional[str]

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: Literal["completion"]

Object type.

For Text Completions, this is always "completion".