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-opus-4-5-20251101", 19 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 - Frontier intelligence at scale — built for coding, agents, and enterprise workflows
claude-opus-4-5-20251101 - Premium model combining maximum intelligence with practical performance
claude-opus-4-5 - Premium model combining maximum intelligence with practical performance
claude-3-7-sonnet-latest - Deprecated: Will reach end-of-life on February 19th, 2026. Please migrate to a newer model. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
claude-3-7-sonnet-20250219 - Deprecated: Will reach end-of-life on February 19th, 2026. Please migrate to a newer model. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
claude-3-5-haiku-latest - Deprecated: Will reach end-of-life on February 19th, 2026. Please migrate to a newer model. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
claude-3-5-haiku-20241022 - Deprecated: Will reach end-of-life on February 19th, 2026. Please migrate to a newer model. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
claude-haiku-4-5 - Hybrid model, capable of near-instant responses and extended thinking
claude-haiku-4-5-20251001 - Hybrid model, capable of near-instant responses and extended thinking
claude-sonnet-4-20250514 - High-performance model with extended thinking
claude-sonnet-4-0 - High-performance model with extended thinking
claude-4-sonnet-20250514 - High-performance model with extended thinking
claude-sonnet-4-5 - Our best model for real-world agents and coding
claude-sonnet-4-5-20250929 - Our best model for real-world agents and coding
claude-opus-4-0 - Our most capable model
claude-opus-4-20250514 - Our most capable model
claude-4-opus-20250514 - Our most capable model
claude-opus-4-1-20250805 - Our most capable model
claude-3-opus-latest - Deprecated: Will reach end-of-life on January 5th, 2026. Please migrate to a newer model. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
claude-3-opus-20240229 - Deprecated: Will reach end-of-life on January 5th, 2026. Please migrate to a newer model. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
claude-3-haiku-20240307 - Our previous most fast and cost-effective

Accepts one of the following:

"claude-opus-4-6"

Most intelligent model for building agents and coding

"claude-sonnet-4-6"

Frontier intelligence at scale — built for coding, agents, and enterprise workflows

"claude-opus-4-5-20251101"

Premium model combining maximum intelligence with practical performance

"claude-opus-4-5"

Premium model combining maximum intelligence with practical performance

"claude-3-7-sonnet-latest"

High-performance model with early extended thinking

"claude-3-7-sonnet-20250219"

High-performance model with early extended thinking

"claude-3-5-haiku-latest"

Fastest and most compact model for near-instant responsiveness

"claude-3-5-haiku-20241022"

Our fastest model

"claude-haiku-4-5"

Hybrid model, capable of near-instant responses and extended thinking

"claude-haiku-4-5-20251001"

Hybrid model, capable of near-instant responses and extended thinking

"claude-sonnet-4-20250514"

High-performance model with extended thinking

"claude-sonnet-4-0"

High-performance model with extended thinking

"claude-4-sonnet-20250514"

High-performance model with extended thinking

"claude-sonnet-4-5"

Our best model for real-world agents and coding

"claude-sonnet-4-5-20250929"

Our best model for real-world agents and coding

"claude-opus-4-0"

Our most capable model

"claude-opus-4-20250514"

Our most capable model

"claude-4-opus-20250514"

Our most capable model

"claude-opus-4-1-20250805"

Our most capable model

"claude-3-opus-latest"

Excels at writing and complex tasks

"claude-3-opus-20240229"

Excels at writing and complex tasks

"claude-3-haiku-20240307"

Our previous most fast and cost-effective

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-opus-4-5-20251101", 19 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 - Frontier intelligence at scale — built for coding, agents, and enterprise workflows
claude-opus-4-5-20251101 - Premium model combining maximum intelligence with practical performance
claude-opus-4-5 - Premium model combining maximum intelligence with practical performance
claude-3-7-sonnet-latest - Deprecated: Will reach end-of-life on February 19th, 2026. Please migrate to a newer model. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
claude-3-7-sonnet-20250219 - Deprecated: Will reach end-of-life on February 19th, 2026. Please migrate to a newer model. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
claude-3-5-haiku-latest - Deprecated: Will reach end-of-life on February 19th, 2026. Please migrate to a newer model. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
claude-3-5-haiku-20241022 - Deprecated: Will reach end-of-life on February 19th, 2026. Please migrate to a newer model. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
claude-haiku-4-5 - Hybrid model, capable of near-instant responses and extended thinking
claude-haiku-4-5-20251001 - Hybrid model, capable of near-instant responses and extended thinking
claude-sonnet-4-20250514 - High-performance model with extended thinking
claude-sonnet-4-0 - High-performance model with extended thinking
claude-4-sonnet-20250514 - High-performance model with extended thinking
claude-sonnet-4-5 - Our best model for real-world agents and coding
claude-sonnet-4-5-20250929 - Our best model for real-world agents and coding
claude-opus-4-0 - Our most capable model
claude-opus-4-20250514 - Our most capable model
claude-4-opus-20250514 - Our most capable model
claude-opus-4-1-20250805 - Our most capable model
claude-3-opus-latest - Deprecated: Will reach end-of-life on January 5th, 2026. Please migrate to a newer model. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
claude-3-opus-20240229 - Deprecated: Will reach end-of-life on January 5th, 2026. Please migrate to a newer model. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
claude-3-haiku-20240307 - Our previous most fast and cost-effective

Accepts one of the following:

"claude-opus-4-6"

Most intelligent model for building agents and coding

"claude-sonnet-4-6"

Frontier intelligence at scale — built for coding, agents, and enterprise workflows

"claude-opus-4-5-20251101"

Premium model combining maximum intelligence with practical performance

"claude-opus-4-5"

Premium model combining maximum intelligence with practical performance

"claude-3-7-sonnet-latest"

High-performance model with early extended thinking

"claude-3-7-sonnet-20250219"

High-performance model with early extended thinking

"claude-3-5-haiku-latest"

Fastest and most compact model for near-instant responsiveness

"claude-3-5-haiku-20241022"

Our fastest model

"claude-haiku-4-5"

Hybrid model, capable of near-instant responses and extended thinking

"claude-haiku-4-5-20251001"

Hybrid model, capable of near-instant responses and extended thinking

"claude-sonnet-4-20250514"

High-performance model with extended thinking

"claude-sonnet-4-0"

High-performance model with extended thinking

"claude-4-sonnet-20250514"

High-performance model with extended thinking

"claude-sonnet-4-5"

Our best model for real-world agents and coding

"claude-sonnet-4-5-20250929"

Our best model for real-world agents and coding

"claude-opus-4-0"

Our most capable model

"claude-opus-4-20250514"

Our most capable model

"claude-4-opus-20250514"

Our most capable model

"claude-opus-4-1-20250805"

Our most capable model

"claude-3-opus-latest"

Excels at writing and complex tasks

"claude-3-opus-20240229"

Excels at writing and complex tasks

"claude-3-haiku-20240307"

Our previous most fast and cost-effective

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".