Add support for max_completion_tokens in OpenAI chat options request

  An upper bound for the number of tokens that can be generated for a completion,
  including visible output tokens and reasoning tokens.
  Replaces max_tokens field which is now deprecated.

Author: dafriz

models/spring-ai-openai/src/main/java/org/springframework/ai/openai/OpenAiChatOptions.java

@@ -82,6 +82,11 @@ public class OpenAiChatOptions implements FunctionCallingOptions, ChatOptions {
 	 * tokens and generated tokens is limited by the model's context length.
 	 */
 	private @JsonProperty("max_tokens") Integer maxTokens;
+	/**
+	 * An upper bound for the number of tokens that can be generated for a completion,
+	 * including visible output tokens and reasoning tokens.
+	 */
+	private @JsonProperty("max_completion_tokens") Integer maxCompletionTokens;
 	/**
 	 * How many chat completion choices to generate for each input message. Note that you will be charged based
 	 * on the number of generated tokens across all of the choices. Keep n as 1 to minimize costs.
@@ -239,6 +244,11 @@ public Builder withMaxTokens(Integer maxTokens) {
 			return this;
 		}
 
+		public Builder withMaxCompletionTokens(Integer maxCompletionTokens) {
+			this.options.maxCompletionTokens = maxCompletionTokens;
+			return this;
+		}
+
 		public Builder withN(Integer n) {
 			this.options.n = n;
 			return this;
@@ -391,6 +401,14 @@ public void setMaxTokens(Integer maxTokens) {
 		this.maxTokens = maxTokens;
 	}
 
+	public Integer getMaxCompletionTokens() {
+		return maxCompletionTokens;
+	}
+
+	public void setMaxCompletionTokens(Integer maxCompletionTokens) {
+		this.maxCompletionTokens = maxCompletionTokens;
+	}
+
 	public Integer getN() {
 		return this.n;
 	}
@@ -556,6 +574,7 @@ public static OpenAiChatOptions fromOptions(OpenAiChatOptions fromOptions) {
 			.withLogprobs(fromOptions.getLogprobs())
 			.withTopLogprobs(fromOptions.getTopLogprobs())
 			.withMaxTokens(fromOptions.getMaxTokens())
+			.withMaxCompletionTokens(fromOptions.getMaxCompletionTokens())
 			.withN(fromOptions.getN())
 			.withPresencePenalty(fromOptions.getPresencePenalty())
 			.withResponseFormat(fromOptions.getResponseFormat())
@@ -578,9 +597,10 @@ public static OpenAiChatOptions fromOptions(OpenAiChatOptions fromOptions) {
 	@Override
 	public int hashCode() {
 		return Objects.hash(this.model, this.frequencyPenalty, this.logitBias, this.logprobs, this.topLogprobs,
-				this.maxTokens, this.n, this.presencePenalty, this.responseFormat, this.streamOptions, this.seed,
-				this.stop, this.temperature, this.topP, this.tools, this.toolChoice, this.user, this.parallelToolCalls,
-				this.functionCallbacks, this.functions, this.httpHeaders, this.proxyToolCalls);
+				this.maxTokens, this.maxCompletionTokens, this.n, this.presencePenalty, this.responseFormat,
+				this.streamOptions, this.seed, this.stop, this.temperature, this.topP, this.tools, this.toolChoice,
+				this.user, this.parallelToolCalls, this.functionCallbacks, this.functions, this.httpHeaders,
+				this.proxyToolCalls);
 	}
 
 	@Override
@@ -593,8 +613,9 @@ public boolean equals(Object o) {
 		return Objects.equals(this.model, other.model) && Objects.equals(this.frequencyPenalty, other.frequencyPenalty)
 				&& Objects.equals(this.logitBias, other.logitBias) && Objects.equals(this.logprobs, other.logprobs)
 				&& Objects.equals(this.topLogprobs, other.topLogprobs)
-				&& Objects.equals(this.maxTokens, other.maxTokens) && Objects.equals(this.n, other.n)
-				&& Objects.equals(this.presencePenalty, other.presencePenalty)
+				&& Objects.equals(this.maxTokens, other.maxTokens)
+				&& Objects.equals(this.maxCompletionTokens, other.maxCompletionTokens)
+				&& Objects.equals(this.n, other.n) && Objects.equals(this.presencePenalty, other.presencePenalty)
 				&& Objects.equals(this.responseFormat, other.responseFormat)
 				&& Objects.equals(this.streamOptions, other.streamOptions) && Objects.equals(this.seed, other.seed)
 				&& Objects.equals(this.stop, other.stop) && Objects.equals(this.temperature, other.temperature)

models/spring-ai-openai/src/main/java/org/springframework/ai/openai/api/OpenAiApi.java

@@ -390,6 +390,8 @@ public Function(String description, String name, String jsonSchema) {
 	 * @param maxTokens The maximum number of tokens to generate in the chat completion.
 	 * The total length of input tokens and generated tokens is limited by the model's
 	 * context length.
+	 * @param maxCompletionTokens An upper bound for the number of tokens that can be
+	 * generated for a completion, including visible output tokens and reasoning tokens.
 	 * @param n How many chat completion choices to generate for each input message. Note
 	 * that you will be charged based on the number of generated tokens across all the
 	 * choices. Keep n as 1 to minimize costs.
@@ -442,6 +444,7 @@ public record ChatCompletionRequest(// @formatter:off
 			@JsonProperty("logprobs") Boolean logprobs,
 			@JsonProperty("top_logprobs") Integer topLogprobs,
 			@JsonProperty("max_tokens") Integer maxTokens,
+			@JsonProperty("max_completion_tokens") Integer maxCompletionTokens,
 			@JsonProperty("n") Integer n,
 			@JsonProperty("presence_penalty") Double presencePenalty,
 			@JsonProperty("response_format") ResponseFormat responseFormat,
@@ -464,7 +467,7 @@ public record ChatCompletionRequest(// @formatter:off
 		 * @param temperature What sampling temperature to use, between 0 and 1.
 		 */
 		public ChatCompletionRequest(List<ChatCompletionMessage> messages, String model, Double temperature) {
-			this(messages, model, null, null, null, null, null, null, null,
+			this(messages, model, null, null, null, null, null, null, null, null,
 					null, null, null, false, null, temperature, null,
 					null, null, null, null);
 		}
@@ -479,7 +482,7 @@ public ChatCompletionRequest(List<ChatCompletionMessage> messages, String model,
 		 * as they become available, with the stream terminated by a data: [DONE] message.
 		 */
 		public ChatCompletionRequest(List<ChatCompletionMessage> messages, String model, Double temperature, boolean stream) {
-			this(messages, model, null, null, null, null, null, null, null,
+			this(messages, model, null, null, null, null, null, null, null, null,
 					null, null, null, stream, null, temperature, null,
 					null, null, null,  null);
 		}
@@ -495,7 +498,7 @@ public ChatCompletionRequest(List<ChatCompletionMessage> messages, String model,
 		 */
 		public ChatCompletionRequest(List<ChatCompletionMessage> messages, String model,
 				List<FunctionTool> tools, Object toolChoice) {
-			this(messages, model, null, null, null, null, null, null, null,
+			this(messages, model, null, null, null, null, null, null, null, null,
 					null, null, null, false, null, 0.8, null,
 					tools, toolChoice, null, null);
 		}
@@ -509,7 +512,7 @@ public ChatCompletionRequest(List<ChatCompletionMessage> messages, String model,
 		 */
 		public ChatCompletionRequest(List<ChatCompletionMessage> messages, Boolean stream) {
 			this(messages, null, null, null, null, null, null, null, null,
-					null, null, null, stream, null, null, null,
+					null, null, null, null, stream, null, null, null,
 					null, null, null, null);
 		}
 
@@ -520,7 +523,7 @@ public ChatCompletionRequest(List<ChatCompletionMessage> messages, Boolean strea
 		 * @return A new {@link ChatCompletionRequest} with the specified stream options.
 		 */
 		public ChatCompletionRequest withStreamOptions(StreamOptions streamOptions) {
-			return new ChatCompletionRequest(messages, model, frequencyPenalty, logitBias, logprobs, topLogprobs, maxTokens, n, presencePenalty,
+			return new ChatCompletionRequest(messages, model, frequencyPenalty, logitBias, logprobs, topLogprobs, maxTokens, maxCompletionTokens, n, presencePenalty,
 					responseFormat, seed, stop, stream, streamOptions, temperature, topP,
 					tools, toolChoice, parallelToolCalls, user);
 		}