diff --git a/.changeset/cyan-bats-jump.md b/.changeset/cyan-bats-jump.md
new file mode 100644
index 0000000..4a5cd7e
--- /dev/null
+++ b/.changeset/cyan-bats-jump.md
@@ -0,0 +1,5 @@
+---
+"@pydantic/logfire-api": patch
+---
+
+Do not format span_name
diff --git a/packages/logfire-api/src/constants.ts b/packages/logfire-api/src/constants.ts
index abbcfe6..49aedc7 100644
--- a/packages/logfire-api/src/constants.ts
+++ b/packages/logfire-api/src/constants.ts
@@ -7,6 +7,7 @@ export const ATTRIBUTES_LEVEL_KEY = `${LOGFIRE_ATTRIBUTES_NAMESPACE}.level_num`
 export const ATTRIBUTES_SPAN_TYPE_KEY = `${LOGFIRE_ATTRIBUTES_NAMESPACE}.span_type`
 export const ATTRIBUTES_TAGS_KEY = `${LOGFIRE_ATTRIBUTES_NAMESPACE}.tags`
 export const ATTRIBUTES_MESSAGE_TEMPLATE_KEY = `${LOGFIRE_ATTRIBUTES_NAMESPACE}.msg_template`
+export const ATTRIBUTES_MESSAGE_KEY = `${LOGFIRE_ATTRIBUTES_NAMESPACE}.msg`
 
 /** Key for storing scrubbed attributes information */
 export const ATTRIBUTES_SCRUBBED_KEY = `${LOGFIRE_ATTRIBUTES_NAMESPACE}.scrubbed`
diff --git a/packages/logfire-api/src/formatter.ts b/packages/logfire-api/src/formatter.ts
index 2b99459..eb6c9c5 100644
--- a/packages/logfire-api/src/formatter.ts
+++ b/packages/logfire-api/src/formatter.ts
@@ -218,13 +218,6 @@ class ChunksFormatter {
 // Create singleton instance
 export const chunksFormatter = new ChunksFormatter()
 
-/**
- * Format a string using a Python-like template syntax
- */
-export function logfireFormat(formatString: string, record: Record<string, unknown>, scrubber: BaseScrubber): string {
-  return logfireFormatWithExtras(formatString, record, scrubber)[0]
-}
-
 /**
  * Format a string with additional information about attributes and templates
  */
@@ -232,11 +225,20 @@ export function logfireFormatWithExtras(
   formatString: string,
   record: Record<string, unknown>,
   scrubber: BaseScrubber
-): [string, Record<string, unknown>, string] {
+): {
+  extraAttributes: Record<string, unknown>
+  formattedMessage: string
+  newTemplate: string
+} {
   try {
-    const [chunks, extraAttrs, newTemplate] = chunksFormatter.chunks(formatString, record, scrubber)
+    const [chunks, extraAttributes, newTemplate] = chunksFormatter.chunks(formatString, record, scrubber)
 
-    return [chunks.map((chunk) => chunk.value).join(''), extraAttrs, newTemplate]
+    const formattedMessage = chunks.map((chunk) => chunk.value).join('')
+    return {
+      extraAttributes,
+      formattedMessage,
+      newTemplate,
+    }
   } catch (err) {
     if (err instanceof KnownFormattingError) {
       console.warn(`Formatting error: ${err.message}`)
@@ -245,7 +247,11 @@ export function logfireFormatWithExtras(
     }
 
     // Formatting failed, use the original format string as the message
-    return [formatString, {}, formatString]
+    return {
+      extraAttributes: {},
+      formattedMessage: formatString,
+      newTemplate: formatString,
+    }
   }
 }
 
diff --git a/packages/logfire-api/src/index.ts b/packages/logfire-api/src/index.ts
index 7fd2a00..2328edf 100644
--- a/packages/logfire-api/src/index.ts
+++ b/packages/logfire-api/src/index.ts
@@ -2,7 +2,13 @@
 import { Span, SpanStatusCode, context as TheContextAPI, trace as TheTraceAPI } from '@opentelemetry/api'
 import { ATTR_EXCEPTION_MESSAGE, ATTR_EXCEPTION_STACKTRACE } from '@opentelemetry/semantic-conventions'
 
-import { ATTRIBUTES_LEVEL_KEY, ATTRIBUTES_MESSAGE_TEMPLATE_KEY, ATTRIBUTES_SPAN_TYPE_KEY, ATTRIBUTES_TAGS_KEY } from './constants'
+import {
+  ATTRIBUTES_LEVEL_KEY,
+  ATTRIBUTES_MESSAGE_KEY,
+  ATTRIBUTES_MESSAGE_TEMPLATE_KEY,
+  ATTRIBUTES_SPAN_TYPE_KEY,
+  ATTRIBUTES_TAGS_KEY,
+} from './constants'
 import { logfireFormatWithExtras } from './formatter'
 import { logfireApiConfig, ScrubbingOptions, serializeAttributes } from './logfireApiConfig'
 
@@ -62,15 +68,16 @@ export function startSpan(
   attributes: Record<string, unknown> = {},
   { log, tags = [], level = Level.Info, parentSpan }: LogOptions = {}
 ): Span {
-  const [formattedMessage, extraAttributes, newTemplate] = logfireFormatWithExtras(msgTemplate, attributes, logfireApiConfig.scrubber)
+  const { formattedMessage, extraAttributes, newTemplate } = logfireFormatWithExtras(msgTemplate, attributes, logfireApiConfig.scrubber)
 
   const context = parentSpan ? TheTraceAPI.setSpan(TheContextAPI.active(), parentSpan) : TheContextAPI.active()
   const span = logfireApiConfig.tracer.startSpan(
-    formattedMessage,
+    msgTemplate,
     {
       attributes: {
         ...serializeAttributes({ ...attributes, ...extraAttributes }),
         [ATTRIBUTES_MESSAGE_TEMPLATE_KEY]: newTemplate,
+        [ATTRIBUTES_MESSAGE_KEY]: formattedMessage,
         [ATTRIBUTES_LEVEL_KEY]: level,
         [ATTRIBUTES_TAGS_KEY]: Array.from(new Set(tags).values()),
         [ATTRIBUTES_SPAN_TYPE_KEY]: log ? 'log' : 'span',
@@ -118,15 +125,16 @@ export function span<R>(msgTemplate: string, ...args: SpanArgsVariant1<R> | Span
     callback = args[2]
   }
 
-  const [formattedMessage, extraAttributes, newTemplate] = logfireFormatWithExtras(msgTemplate, attributes, logfireApiConfig.scrubber)
+  const { formattedMessage, extraAttributes, newTemplate } = logfireFormatWithExtras(msgTemplate, attributes, logfireApiConfig.scrubber)
 
   const context = parentSpan ? TheTraceAPI.setSpan(TheContextAPI.active(), parentSpan) : TheContextAPI.active()
   return logfireApiConfig.tracer.startActiveSpan(
-    formattedMessage,
+    msgTemplate,
     {
       attributes: {
         ...serializeAttributes({ ...attributes, ...extraAttributes }),
         [ATTRIBUTES_MESSAGE_TEMPLATE_KEY]: newTemplate,
+        [ATTRIBUTES_MESSAGE_KEY]: formattedMessage,
         [ATTRIBUTES_LEVEL_KEY]: level,
         [ATTRIBUTES_TAGS_KEY]: Array.from(new Set(tags).values()),
       },