diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index aaf968a..b56c3d0 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.1.0-alpha.3"
+  ".": "0.1.0-alpha.4"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index a2e8f7c..1ff3d8b 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 13
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/the-san-francisco-compute-company%2Fsfc-nodes-92d29637c0ceda06c752ad70b078ff8dad505843c16b923130774376890baaa5.yml
-openapi_spec_hash: 1f20f7d76aa5575ee0601ece537af956
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/the-san-francisco-compute-company%2Fsfc-nodes-899f22ed979e4df6977752fc5de114b92954d5f7499c032fc6aaa58fabd49862.yml
+openapi_spec_hash: 95300d446039582ec24c2997bf975ad2
 config_hash: cf202573c712b5d91a4d496f35f0ff57
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 783e72f..9610c9e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,21 @@
 # Changelog
 
+## 0.1.0-alpha.4 (2025-11-07)
+
+Full Changelog: [v0.1.0-alpha.3...v0.1.0-alpha.4](https://github.com/sfcompute/nodes-go/compare/v0.1.0-alpha.3...v0.1.0-alpha.4)
+
+### Features
+
+* **api:** api update ([1342c39](https://github.com/sfcompute/nodes-go/commit/1342c3989b487bd7725ab95ba720c7da200c6899))
+* **api:** api update ([02e6349](https://github.com/sfcompute/nodes-go/commit/02e6349b1823ed96fecf3353231e32b00ef3989b))
+* **api:** api update ([26ba165](https://github.com/sfcompute/nodes-go/commit/26ba165c4e22a00f69c89f53edf7b0445057594f))
+
+
+### Chores
+
+* **internal:** codegen related update ([766d0aa](https://github.com/sfcompute/nodes-go/commit/766d0aaf277f7c0733d15ba33111d5e9519660a8))
+* **internal:** grammar fix (it's -> its) ([1a198ba](https://github.com/sfcompute/nodes-go/commit/1a198bad6aa4689cecfaccec1953310a60a1a47c))
+
 ## 0.1.0-alpha.3 (2025-10-13)
 
 Full Changelog: [v0.1.0-alpha.2...v0.1.0-alpha.3](https://github.com/sfcompute/nodes-go/compare/v0.1.0-alpha.2...v0.1.0-alpha.3)
diff --git a/README.md b/README.md
index dbad93d..43ac98e 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ Or to pin the version:
 <!-- x-release-please-start-version -->
 
 ```sh
-go get -u 'github.com/sfcompute/nodes-go@v0.1.0-alpha.3'
+go get -u 'github.com/sfcompute/nodes-go@v0.1.0-alpha.4'
 ```
 
 <!-- x-release-please-end -->
@@ -125,7 +125,7 @@ custom := param.Override[sfcnodes.FooParams](12)
 
 ### Request unions
 
-Unions are represented as a struct with fields prefixed by "Of" for each of it's variants,
+Unions are represented as a struct with fields prefixed by "Of" for each of its variants,
 only one field can be non-zero. The non-zero field will be serialized.
 
 Sub-properties of the union can be accessed via methods on the union struct.
diff --git a/internal/apijson/encoder.go b/internal/apijson/encoder.go
index 8358a2f..ab7a3c1 100644
--- a/internal/apijson/encoder.go
+++ b/internal/apijson/encoder.go
@@ -16,6 +16,10 @@ import (
 
 var encoders sync.Map // map[encoderEntry]encoderFunc
 
+// If we want to set a literal key value into JSON using sjson, we need to make sure it doesn't have
+// special characters that sjson interprets as a path.
+var EscapeSJSONKey = strings.NewReplacer("\\", "\\\\", "|", "\\|", "#", "\\#", "@", "\\@", "*", "\\*", ".", "\\.", ":", "\\:", "?", "\\?").Replace
+
 func Marshal(value any) ([]byte, error) {
 	e := &encoder{dateFormat: time.RFC3339}
 	return e.marshal(value)
@@ -270,7 +274,7 @@ func (e *encoder) newStructTypeEncoder(t reflect.Type) encoderFunc {
 			if encoded == nil {
 				continue
 			}
-			json, err = sjson.SetRawBytes(json, ef.tag.name, encoded)
+			json, err = sjson.SetRawBytes(json, EscapeSJSONKey(ef.tag.name), encoded)
 			if err != nil {
 				return nil, err
 			}
@@ -348,7 +352,7 @@ func (e *encoder) encodeMapEntries(json []byte, v reflect.Value) ([]byte, error)
 			}
 			encodedKeyString = string(encodedKeyBytes)
 		}
-		encodedKey := []byte(sjsonReplacer.Replace(encodedKeyString))
+		encodedKey := []byte(encodedKeyString)
 		pairs = append(pairs, mapPair{key: encodedKey, value: iter.Value()})
 	}
 
@@ -366,7 +370,7 @@ func (e *encoder) encodeMapEntries(json []byte, v reflect.Value) ([]byte, error)
 		if len(encodedValue) == 0 {
 			continue
 		}
-		json, err = sjson.SetRawBytes(json, string(p.key), encodedValue)
+		json, err = sjson.SetRawBytes(json, EscapeSJSONKey(string(p.key)), encodedValue)
 		if err != nil {
 			return nil, err
 		}
@@ -386,7 +390,3 @@ func (e *encoder) newMapEncoder(_ reflect.Type) encoderFunc {
 		return json, nil
 	}
 }
-
-// If we want to set a literal key value into JSON using sjson, we need to make sure it doesn't have
-// special characters that sjson interprets as a path.
-var sjsonReplacer *strings.Replacer = strings.NewReplacer(".", "\\.", ":", "\\:", "*", "\\*")
diff --git a/internal/apijson/union.go b/internal/apijson/union.go
index c961275..08057d4 100644
--- a/internal/apijson/union.go
+++ b/internal/apijson/union.go
@@ -78,7 +78,7 @@ func (d *decoderBuilder) newStructUnionDecoder(t reflect.Type) decoderFunc {
 
 	return func(n gjson.Result, v reflect.Value, state *decoderState) error {
 		if discriminated && n.Type == gjson.JSON && len(unionEntry.discriminatorKey) != 0 {
-			discriminator := n.Get(unionEntry.discriminatorKey).Value()
+			discriminator := n.Get(EscapeSJSONKey(unionEntry.discriminatorKey)).Value()
 			for _, decoder := range discriminatedDecoders {
 				if discriminator == decoder.discriminator {
 					inner := v.FieldByIndex(decoder.field.Index)
@@ -162,7 +162,7 @@ func (d *decoderBuilder) newUnionDecoder(t reflect.Type) decoderFunc {
 			}
 
 			if len(unionEntry.discriminatorKey) != 0 {
-				discriminatorValue := n.Get(unionEntry.discriminatorKey).Value()
+				discriminatorValue := n.Get(EscapeSJSONKey(unionEntry.discriminatorKey)).Value()
 				if discriminatorValue == variant.DiscriminatorValue {
 					inner := reflect.New(variant.Type).Elem()
 					err := decoder(n, inner, state)
diff --git a/internal/version.go b/internal/version.go
index 2d1d85e..5469df6 100644
--- a/internal/version.go
+++ b/internal/version.go
@@ -2,4 +2,4 @@
 
 package internal
 
-const PackageVersion = "0.1.0-alpha.3" // x-release-please-version
+const PackageVersion = "0.1.0-alpha.4" // x-release-please-version
diff --git a/node.go b/node.go
index 73f0ea9..f6a1b2a 100644
--- a/node.go
+++ b/node.go
@@ -140,10 +140,12 @@ type CreateNodesRequestParam struct {
 	CloudInitUserData param.Opt[string] `json:"cloud_init_user_data,omitzero" format:"byte"`
 	// Custom image ID to use for the VM instances
 	ImageID param.Opt[string] `json:"image_id,omitzero"`
-	// Start time as Unix timestamp in seconds Required for reserved nodes
+	// Start time as Unix timestamp in seconds Optional for reserved nodes. If not
+	// provided, defaults to now
 	StartAt param.Opt[int64] `json:"start_at,omitzero"`
-	// Custom node names Names cannot follow the vm\_{alpha_numeric_chars} as this is
-	// reserved for system-generated IDs Names cannot be numeric strings
+	// Custom node names Names cannot begin with 'vm*' or 'n*' as this is reserved for
+	// system-generated IDs Names cannot be numeric strings Names cannot exceed 128
+	// characters
 	Names []string `json:"names,omitzero"`
 	// Any of "autoreserved", "reserved".
 	NodeType NodeType `json:"node_type,omitzero"`
diff --git a/packages/param/encoder.go b/packages/param/encoder.go
index e35ae27..7c3a221 100644
--- a/packages/param/encoder.go
+++ b/packages/param/encoder.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"reflect"
+	"strings"
 	"time"
 
 	shimjson "github.com/sfcompute/nodes-go/internal/encoding/json"
@@ -14,6 +15,10 @@ import (
 // EncodedAsDate is not be stable and shouldn't be relied upon
 type EncodedAsDate Opt[time.Time]
 
+// If we want to set a literal key value into JSON using sjson, we need to make sure it doesn't have
+// special characters that sjson interprets as a path.
+var EscapeSJSONKey = strings.NewReplacer("\\", "\\\\", "|", "\\|", "#", "\\#", "@", "\\@", "*", "\\*", ".", "\\.", ":", "\\:", "?", "\\?").Replace
+
 type forceOmit int
 
 func (m EncodedAsDate) MarshalJSON() ([]byte, error) {
@@ -52,7 +57,7 @@ func MarshalWithExtras[T ParamStruct, R any](f T, underlying any, extras map[str
 				}
 				continue
 			}
-			bytes, err = sjson.SetBytes(bytes, k, v)
+			bytes, err = sjson.SetBytes(bytes, EscapeSJSONKey(k), v)
 			if err != nil {
 				return nil, err
 			}
diff --git a/packages/respjson/respjson.go b/packages/respjson/respjson.go
index cc0088c..9e61c5c 100644
--- a/packages/respjson/respjson.go
+++ b/packages/respjson/respjson.go
@@ -5,7 +5,7 @@ package respjson
 // Use [Field.Valid] to check if an optional value was null or omitted.
 //
 // A Field will always occur in the following structure, where it
-// mirrors the original field in it's parent struct:
+// mirrors the original field in its parent struct:
 //
 //	type ExampleObject struct {
 //		Foo bool	`json:"foo"`
diff --git a/vm.go b/vm.go
index 675fc64..ca30cf2 100644
--- a/vm.go
+++ b/vm.go
@@ -97,16 +97,22 @@ func (r *VMLogsResponseData) UnmarshalJSON(data []byte) error {
 }
 
 type VmsshResponse struct {
-	SSHHostname string                    `json:"ssh_hostname,required"`
-	SSHPort     int64                     `json:"ssh_port,required"`
-	SSHHostKeys []VmsshResponseSSHHostKey `json:"ssh_host_keys,nullable"`
+	SSHHostname string `json:"ssh_hostname,required"`
+	SSHPort     int64  `json:"ssh_port,required"`
+	// Unix timestamp in seconds since epoch
+	LastAttemptedKeyUpdate int64 `json:"last_attempted_key_update,nullable"`
+	// Unix timestamp in seconds since epoch
+	LastSuccessfulKeyUpdate int64                     `json:"last_successful_key_update,nullable"`
+	SSHHostKeys             []VmsshResponseSSHHostKey `json:"ssh_host_keys,nullable"`
 	// JSON contains metadata for fields, check presence with [respjson.Field.Valid].
 	JSON struct {
-		SSHHostname respjson.Field
-		SSHPort     respjson.Field
-		SSHHostKeys respjson.Field
-		ExtraFields map[string]respjson.Field
-		raw         string
+		SSHHostname             respjson.Field
+		SSHPort                 respjson.Field
+		LastAttemptedKeyUpdate  respjson.Field
+		LastSuccessfulKeyUpdate respjson.Field
+		SSHHostKeys             respjson.Field
+		ExtraFields             map[string]respjson.Field
+		raw                     string
 	} `json:"-"`
 }
 
@@ -117,7 +123,7 @@ func (r *VmsshResponse) UnmarshalJSON(data []byte) error {
 }
 
 type VmsshResponseSSHHostKey struct {
-	Base64EncodedKey string `json:"base64_encoded_key,required"`
+	Base64EncodedKey string `json:"base64_encoded_key,required" format:"byte"`
 	KeyType          string `json:"key_type,required"`
 	// JSON contains metadata for fields, check presence with [respjson.Field.Valid].
 	JSON struct {
diff --git a/vmimage.go b/vmimage.go
index 90fcc19..d821cae 100644
--- a/vmimage.go
+++ b/vmimage.go
@@ -127,6 +127,8 @@ type VMImageGetResponse struct {
 	Name string `json:"name,required"`
 	// Any of "image".
 	Object VMImageGetResponseObject `json:"object,required"`
+	// Size of the image file in bytes
+	ObjectSize int64 `json:"object_size,required"`
 	// SHA256 hash of the image file for integrity verification
 	Sha256Hash string `json:"sha256_hash,required"`
 	// JSON contains metadata for fields, check presence with [respjson.Field.Valid].
@@ -136,6 +138,7 @@ type VMImageGetResponse struct {
 		ImageID     respjson.Field
 		Name        respjson.Field
 		Object      respjson.Field
+		ObjectSize  respjson.Field
 		Sha256Hash  respjson.Field
 		ExtraFields map[string]respjson.Field
 		raw         string