diff --git a/src/cmd/go/internal/cache/cache.go b/src/cmd/go/internal/cache/cache.go
index 1bef1db08c..26913dd959 100644
--- a/src/cmd/go/internal/cache/cache.go
+++ b/src/cmd/go/internal/cache/cache.go
@@ -59,7 +59,7 @@ type Cache interface {
 	// background cleanup work started earlier. Any cache trimming in one
 	// process should not cause the invariants of this interface to be
 	// violated in another process. Namely, a cache trim from one process should
-	// not delete an ObjectID from disk that was recently Get or Put from
+	// not delete an OutputID from disk that was recently Get or Put from
 	// another process. As a rule of thumb, don't trim things used in the last
 	// day.
 	Close() error
diff --git a/src/cmd/go/internal/cache/prog.go b/src/cmd/go/internal/cache/prog.go
index bfddf5e4de..74e9dc9de5 100644
--- a/src/cmd/go/internal/cache/prog.go
+++ b/src/cmd/go/internal/cache/prog.go
@@ -15,7 +15,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"internal/goexperiment"
 	"io"
 	"log"
 	"os"
@@ -330,18 +329,10 @@ func (c *ProgCache) Put(a ActionID, file io.ReadSeeker) (_ OutputID, size int64,
 		return out, size, nil
 	}
 
-	// For compatibility with Go 1.23/1.24 GOEXPERIMENT=gocacheprog users, also
-	// populate the deprecated ObjectID field. This will be removed in Go 1.25.
-	var deprecatedValue []byte
-	if goexperiment.CacheProg {
-		deprecatedValue = out[:]
-	}
-
 	res, err := c.send(c.ctx, &cacheprog.Request{
 		Command:  cacheprog.CmdPut,
 		ActionID: a[:],
 		OutputID: out[:],
-		ObjectID: deprecatedValue, // TODO(bradfitz): remove in Go 1.25
 		Body:     file,
 		BodySize: size,
 	})
diff --git a/src/cmd/go/internal/cacheprog/cacheprog.go b/src/cmd/go/internal/cacheprog/cacheprog.go
index a2796592df..9379636e5a 100644
--- a/src/cmd/go/internal/cacheprog/cacheprog.go
+++ b/src/cmd/go/internal/cacheprog/cacheprog.go
@@ -76,9 +76,6 @@ type Request struct {
 	ActionID []byte `json:",omitempty"` // or nil if not used
 
 	// OutputID is stored with the body for "put" requests.
-	//
-	// Prior to Go 1.24, when GOCACHEPROG was still an experiment, this was
-	// accidentally named ObjectID. It was renamed to OutputID in Go 1.24.
 	OutputID []byte `json:",omitempty"` // or nil if not used
 
 	// Body is the body for "put" requests. It's sent after the JSON object
@@ -91,14 +88,6 @@ type Request struct {
 
 	// BodySize is the number of bytes of Body. If zero, the body isn't written.
 	BodySize int64 `json:",omitempty"`
-
-	// ObjectID is the accidental spelling of OutputID that was used prior to Go
-	// 1.24.
-	//
-	// Deprecated: use OutputID. This field is only populated temporarily for
-	// backwards compatibility with Go 1.23 and earlier when
-	// GOEXPERIMENT=gocacheprog is set. It will be removed in Go 1.25.
-	ObjectID []byte `json:",omitempty"`
 }
 
 // Response is the JSON response from the child process to the go command.
@@ -125,7 +114,7 @@ type Response struct {
 	// For "get" requests.
 
 	Miss     bool       `json:",omitempty"` // cache miss
-	OutputID []byte     `json:",omitempty"` // the ObjectID stored with the body
+	OutputID []byte     `json:",omitempty"` // the OutputID stored with the body
 	Size     int64      `json:",omitempty"` // body size in bytes
 	Time     *time.Time `json:",omitempty"` // when the object was put in the cache (optional; used for cache expiration)