Enum ClaudeModel 

pub enum ClaudeModel {
    Sonnet,
    Opus,
    Haiku,
    Fable,
    Best,
    OpusPlan,
    Sonnet1m,
    Opus1m,
    Fable1m,
    Fable51,
    Fable5,
    Mythos51,
    Mythos5,
    Opus55,
    Opus5,
    Opus48,
    Opus47,
    Opus46,
    Opus45,
    Opus41,
    Opus40,
    Sonnet55,
    Sonnet5,
    Sonnet46,
    Sonnet45,
    Sonnet40,
    Sonnet37,
    Sonnet35,
    Haiku55,
    Haiku45,
    Haiku35,
    Custom(String),
}

A model selector accepted by claude --model.

Variants

Sonnet

Newest Sonnet-family model (floating alias sonnet). Resolves to claude-sonnet-5-5 first-party as of CLI 2.1.284.

Opus

Newest Opus-family model (floating alias opus). Resolves to claude-opus-5-5 first-party as of CLI 2.1.280.

Haiku

Newest Haiku-family model (floating alias haiku). Resolves to claude-haiku-5-5 first-party as of CLI 2.1.293; Bedrock, Vertex, Foundry and the gateway still resolve it to claude-haiku-4-5.

Fable

Newest Fable-family model (floating alias fable).

Best

The most capable model available to the account (alias best).

OpusPlan

Opus for plan mode, Sonnet otherwise (alias opusplan).

Sonnet1m

Newest Sonnet with the 1M-token context beta (alias sonnet[1m]).

Opus1m

Newest Opus with the 1M-token context beta (alias opus[1m]).

Fable1m

Newest Fable with the 1M-token context beta (alias fable[1m]).

Fable51

Fable 5.1 (claude-fable-5-1).

Fable5

Fable 5 (claude-fable-5).

Mythos51

Mythos 5.1 (claude-mythos-5-1).

Mythos5

Mythos 5 (claude-mythos-5).

Opus55

Opus 5.5 (claude-opus-5-5), released 2026-09-22 — the new first-party float target of the opus alias.

Opus5

Opus 5 (claude-opus-5).

Opus48

Opus 4.8 (claude-opus-4-8).

Opus47

Opus 4.7 (claude-opus-4-7).

Opus46

Opus 4.6 (claude-opus-4-6).

Opus45

Opus 4.5 (claude-opus-4-5).

Opus41

Opus 4.1 (claude-opus-4-1).

Opus40

Opus 4 (claude-opus-4-0).

Sonnet55

Sonnet 5.5 (claude-sonnet-5-5), released 2026-09-28 — the new first-party float target of the sonnet alias.

Sonnet5

Sonnet 5 (claude-sonnet-5).

Sonnet46

Sonnet 4.6 (claude-sonnet-4-6).

Sonnet45

Sonnet 4.5 (claude-sonnet-4-5).

Sonnet40

Sonnet 4 (claude-sonnet-4-0).

Sonnet37

Sonnet 3.7 (claude-3-7-sonnet).

Sonnet35

Sonnet 3.5 (claude-3-5-sonnet).

Haiku55

Haiku 5.5 (claude-haiku-5-5), added in CLI 2.1.293 — the new first-party float target of the haiku alias.

Haiku45

Haiku 4.5 (claude-haiku-4-5).

Haiku35

Haiku 3.5 (claude-3-5-haiku).

Custom(String)

A model string not yet known to this version of the crate. Passed to the CLI verbatim.

Implementations

impl ClaudeModel

pub fn cli_arg(&self) -> &str

The string to pass to claude --model for this model.

pub fn as_str(&self) -> &str

Alias for cli_arg, matching the crate’s string-enum convention.

pub fn display_name(&self) -> &str

Human-friendly display name, matching what the CLI’s own UI renders.

pub fn is_alias(&self) -> bool

True for the floating aliases (sonnet, opus, …) that the CLI resolves to the newest model of the family at session start.

pub fn known() -> &'static [ClaudeModel]

Every model known to this version of the crate, aliases first.

Trait Implementations

impl Clone for ClaudeModel

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ClaudeModel

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ClaudeModel

fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl Display for ClaudeModel

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for ClaudeModel

impl From<&str> for ClaudeModel

fn from(s: &str) -> Self

Converts to this type from the input type.

impl From<ClaudeModel> for String

fn from(model: ClaudeModel) -> Self

Converts to this type from the input type.

impl Hash for ClaudeModel

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for ClaudeModel

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for ClaudeModel

fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for ClaudeModel