* {@code null} means use the model default, {@code 0} disables thinking.
     *
     * @param thinkingBudget the thinking budget
     * @return this request for method chaining
     */
    public LlmChatRequest setThinkingBudget(final Integer thinkingBudget) {
        this.thinkingBudget = thinkingBudget;
        return this;
    }

    /**
     * Gets the extra parameters for provider-specific settings.
     *

        }
        final String thinkingBudget = config.getOrDefault(prefix + ".thinking.budget", null);
        if (thinkingBudget != null) {
            request.setThinkingBudget(Integer.parseInt(thinkingBudget));
        }
    }

    // --- Locale support methods ---

    /**
     * Gets the user's locale from the current request context.
     *