Computer use not working on openai models via bedrock-mantle

Computer use on Amazon Bedrock is currently only supported on specific Anthropic Claude models through both the bedrock-runtime and bedrock-mantle endpoints, not on OpenAI models like GPT-5.4. To use computer use functionality, you need to work with models that explicitly support it—you can check the Capabilities and Features table in the Models at a glance section to identify which models have this capability.

For computer use to work, your request must include an anthropic_beta entry with a computer-use beta version (such as computer-use-2025-11-24) and one or more Anthropic pre-defined tool entries with matching type fields (like computer_20251124, bash_20250124, or text_editor_20250124). Submitting a request to a model that doesn't support computer use, or pairing a tool type with an unsupported model, will return a 400 invalid_request_error.

Regarding GPT-5.4 on bedrock-mantle: while the model card mentions computer use as a general capability description, the supported features table shows that GPT-5.4 supports server-side and client-side tool calling, but does not list computer use as an available feature through the bedrock-mantle endpoint. The error message you're receiving correctly indicates the supported tool types for GPT-5.4 are: function, mcp, custom, namespace, and tool_search—not the computer use tool types.

If you need computer use functionality, you'll want to use one of the Anthropic Claude models that explicitly support this feature rather than GPT-5.4.
Sources
Use computer use tools to automate GUI tasks with Amazon Bedrock models - Amazon Bedrock
GPT-5.4 - Amazon Bedrock

1. Should computer use work via Bedrock? While the model itself is technically capable of it, it does not currently work with the Bedrock Mantle implementation. This is likely not a limitation of the model itself, but rather due to the fact that Bedrock's tool type implementation does not yet support it.

2. Correct tool types and request formats: Currently, none of the formats accepted by Bedrock Mantle support computer use. OpenAI's native {"type": "computer"} (GA) and computer_use_preview (legacy) are both rejected by Bedrock Mantle.

3. Available regions: Since the feature does not currently work, I could not find definitive information regarding region availability.

4. Can the model card be corrected?: As this represents a clear discrepancy between documentation and implementation that affects actual usage, I strongly recommend formally reporting it to AWS Support. When reporting, it would be helpful to include the following:

The specific section of the model card URL (https://docs.aws.amazon.com/bedrock/latest/userguide/model-card-openai-gpt-54.html) that claims support for the computer use feature. Specific verification results showing that requests using {"type": "computer"}, computer_use_preview, computer-preview, or local_shell are all rejected. The actual error message indicating that only function, mcp, custom, namespace, and tool_search are returned as supported tool types.

Since Bedrock Mantle is a new feature that is still evolving, this type of gap—where the model card claims a new feature but the pass-through implementation hasn't caught up yet—is likely a temporary state that will be corrected in the future. Submitting this as feedback is the most reliable next step.