OTLP compatibility

This page lists, for each exporter library and pinned version, which Spanlight fields a span sent through OTLP ingestion fills. Supported means a green fixture: each table below comes from a fixture that holds the exact bytes the library exported for each scenario and the rows Spanlight is expected to store for them. The contract test posts those bytes on every change and checks every field, so the tables cannot drift from what the code does. The otlp-matrix-weekly workflow re-records every library at its latest release each week and reports any breakage.

Each cell says one of four things:

• captured: Spanlight stores the field from what the library sends.
• not sent by the exporter: the library does not send the field in this scenario, so it stays empty (“—” in the app).
• not read: the library sends the field in a form Spanlight does not read, a documented non-goal of the OTLP path (OpenInference sends the time to first token as a span event, and span events are not read).
• not captured: the scenario stores no value for the field, for example no finish reason on a request that failed.

For which attribute fills which field, see OTLP attribute mapping.

Recorded libraries

litellm 1.105.1

Recorded 2026-10-17T20:42:33Z on python 3.13.9 with OpenTelemetry SDK 1.45.1 (harness sdks/fixtures/otlp/record@e0893b3). Fixture: sdks/fixtures/otlp/litellm/1.105.1.json.

Scenario	Provider	Model	Input tokens	Output tokens	Cached	Cache writes	Prompt	Completion	Finish reason	TTFT	Kind	Error class	Trace fields	Metadata	Usage rollup
chat_genai_latest	captured	captured	captured	captured	not sent by the exporter	not captured	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not captured	captured
chat_legacy	captured	captured	captured	captured	not sent by the exporter	not captured	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not captured	captured
error_429	captured	captured	not sent by the exporter	not sent by the exporter	not sent by the exporter	not sent by the exporter	captured	not captured	not captured	not sent by the exporter	captured	captured	captured	not captured	captured
joined_parent_span	captured	captured	captured	captured	not sent by the exporter	not captured	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not captured	captured

openinference-langchain 0.1.79

Recorded 2026-10-17T20:37:03Z on python 3.13.9 with OpenTelemetry SDK 1.45.1 (harness sdks/fixtures/otlp/record@e0893b3). Fixture: sdks/fixtures/otlp/openinference-langchain/0.1.79.json.

Scenario	Provider	Model	Input tokens	Output tokens	Cached	Cache writes	Prompt	Completion	Finish reason	TTFT	Kind	Error class	Trace fields	Metadata	Usage rollup
agent_tool_llm	captured	captured	captured	captured	captured	not captured	captured	captured	captured	not sent by the exporter	captured	not captured	captured	captured	captured
chain_llm	captured	captured	captured	captured	captured	not captured	captured	captured	captured	not sent by the exporter	captured	not captured	captured	captured	captured
retriever	captured	captured	captured	captured	captured	not captured	captured	captured	captured	not sent by the exporter	captured	not captured	captured	captured	captured

openinference-langgraph 1.2.16

Recorded 2026-10-19T11:03:56Z on python 3.13.9 with OpenTelemetry SDK 1.45.1 (harness sdks/fixtures/otlp/record@fbcff15). Fixture: sdks/fixtures/otlp/openinference-langgraph/1.2.16.json.

Scenario	Provider	Model	Input tokens	Output tokens	Cached	Cache writes	Prompt	Completion	Finish reason	TTFT	Kind	Error class	Trace fields	Metadata	Usage rollup
agent_tool_llm	captured	captured	captured	captured	captured	not captured	captured	captured	captured	not sent by the exporter	captured	not captured	captured	captured	captured

openinference-llama-index 4.6.0

Recorded 2026-10-19T11:04:39Z on python 3.13.9 with OpenTelemetry SDK 1.45.1 (harness sdks/fixtures/otlp/record@fbcff15). Fixture: sdks/fixtures/otlp/openinference-llama-index/4.6.0.json.

Scenario	Provider	Model	Input tokens	Output tokens	Cached	Cache writes	Prompt	Completion	Finish reason	TTFT	Kind	Error class	Trace fields	Metadata	Usage rollup
agent_tool_llm	captured	captured	captured	captured	captured	not captured	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not captured	captured

openinference-openai 0.1.65

Recorded 2026-10-17T20:44:16Z on python 3.13.9 with OpenTelemetry SDK 1.45.1 (harness sdks/fixtures/otlp/record@e0893b3). Fixture: sdks/fixtures/otlp/openinference-openai/0.1.65.json.

Scenario	Provider	Model	Input tokens	Output tokens	Cached	Cache writes	Prompt	Completion	Finish reason	TTFT	Kind	Error class	Trace fields	Metadata	Usage rollup
chat	captured	captured	captured	captured	captured	not captured	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not captured	captured
error	captured	not sent by the exporter	not sent by the exporter	not sent by the exporter	not sent by the exporter	not sent by the exporter	captured	not captured	not captured	not read	captured	captured	captured	not captured	captured
streaming	captured	captured	captured	captured	captured	not captured	captured	captured	captured	not read	captured	not captured	captured	not captured	captured
tool_call	captured	captured	captured	captured	captured	not captured	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not captured	captured

openinference-openai-agents 2.5.3

Recorded 2026-10-19T11:04:10Z on python 3.13.9 with OpenTelemetry SDK 1.45.1 (harness sdks/fixtures/otlp/record@fbcff15). Fixture: sdks/fixtures/otlp/openinference-openai-agents/2.5.3.json.

Scenario	Provider	Model	Input tokens	Output tokens	Cached	Cache writes	Prompt	Completion	Finish reason	TTFT	Kind	Error class	Trace fields	Metadata	Usage rollup
agent_tool_llm	captured	captured	captured	captured	not sent by the exporter	not captured	captured	captured	not sent by the exporter	not sent by the exporter	captured	not captured	captured	not captured	captured

otel-genai-python 2.4b0

Recorded 2026-10-17T20:35:37Z on python 3.13.9 with OpenTelemetry SDK 1.45.1 (harness sdks/fixtures/otlp/record@e0893b3). Fixture: sdks/fixtures/otlp/otel-genai-python/2.4b0.json.

Scenario	Provider	Model	Input tokens	Output tokens	Cached	Cache writes	Prompt	Completion	Finish reason	TTFT	Kind	Error class	Trace fields	Metadata	Usage rollup
chat	captured	captured	captured	captured	not sent by the exporter	not captured	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not captured	captured
chat_tool_call	captured	captured	captured	captured	not sent by the exporter	not captured	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not captured	captured
error_429	captured	captured	not sent by the exporter	not sent by the exporter	not sent by the exporter	not sent by the exporter	captured	not sent by the exporter	not captured	not captured	captured	captured	captured	not captured	captured
streaming	captured	captured	captured	captured	not sent by the exporter	not captured	captured	captured	not sent by the exporter	not sent by the exporter	captured	not captured	captured	not captured	captured

pydantic-ai 2.57.0

Recorded 2026-10-19T11:04:19Z on python 3.13.9 with OpenTelemetry SDK 1.45.1 (harness sdks/fixtures/otlp/record@fbcff15). Fixture: sdks/fixtures/otlp/pydantic-ai/2.57.0.json.

Scenario	Provider	Model	Input tokens	Output tokens	Cached	Cache writes	Prompt	Completion	Finish reason	TTFT	Kind	Error class	Trace fields	Metadata	Usage rollup
agent_tool_llm	captured	captured	captured	captured	captured	not captured	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not captured	captured
agent_tool_llm_plain_usage	captured	captured	captured	captured	captured	not captured	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not captured	captured

traceloop-openai 0.62.4

Recorded 2026-10-17T20:39:23Z on python 3.13.9 with OpenTelemetry SDK 1.45.1 (harness sdks/fixtures/otlp/record@e0893b3). Fixture: sdks/fixtures/otlp/traceloop-openai/0.62.4.json.

Scenario	Provider	Model	Input tokens	Output tokens	Cached	Cache writes	Prompt	Completion	Finish reason	TTFT	Kind	Error class	Trace fields	Metadata	Usage rollup
agent_tool	captured	captured	captured	captured	captured	not captured	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not captured	captured
workflow_task_chat	captured	captured	captured	captured	captured	not captured	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not captured	captured

vercel-ai-genai 7.0.142

Recorded 2026-10-17T20:45:24Z on node 24.11.1 with OpenTelemetry SDK 2.12.0 (harness sdks/fixtures/otlp/record@e0893b3). Fixture: sdks/fixtures/otlp/vercel-ai-genai/7.0.142.json.

Scenario	Provider	Model	Input tokens	Output tokens	Cached	Cache writes	Prompt	Completion	Finish reason	TTFT	Kind	Error class	Trace fields	Metadata	Usage rollup
error	captured	captured	not sent by the exporter	not sent by the exporter	not sent by the exporter	not sent by the exporter	captured	not sent by the exporter	not captured	not captured	captured	captured	captured	not captured	captured
generate_object	captured	captured	captured	captured	captured	not sent by the exporter	captured	captured	captured	not sent by the exporter	captured	captured	captured	not captured	captured
generate_text_with_metadata	captured	captured	captured	captured	captured	not sent by the exporter	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not sent by the exporter	captured
stream_text	captured	captured	captured	captured	captured	not sent by the exporter	captured	captured	captured	captured	captured	not captured	captured	not captured	captured
tool_call	captured	captured	captured	captured	captured	not sent by the exporter	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not captured	captured

vercel-ai-legacy 5.0.0

Recorded 2026-10-17T20:45:12Z on node 24.11.1 with OpenTelemetry SDK 2.12.0 (harness sdks/fixtures/otlp/record@e0893b3). Fixture: sdks/fixtures/otlp/vercel-ai-legacy/5.0.0.json.

Scenario	Provider	Model	Input tokens	Output tokens	Cached	Cache writes	Prompt	Completion	Finish reason	TTFT	Kind	Error class	Trace fields	Metadata	Usage rollup
error	captured	captured	not sent by the exporter	not sent by the exporter	not sent by the exporter	not sent by the exporter	captured	not sent by the exporter	not captured	not captured	captured	captured	captured	not captured	captured
generate_object	captured	captured	captured	captured	not sent by the exporter	not sent by the exporter	captured	captured	captured	not sent by the exporter	captured	captured	captured	not captured	captured
generate_text_with_metadata	captured	captured	captured	captured	not sent by the exporter	not sent by the exporter	captured	captured	captured	not sent by the exporter	captured	not captured	captured	captured	captured
stream_text	captured	captured	captured	captured	captured	not sent by the exporter	captured	captured	captured	captured	captured	not captured	captured	not captured	captured
tool_call	captured	captured	captured	captured	not sent by the exporter	not sent by the exporter	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not captured	captured

vercel-ai-legacy 6.0.0

Recorded 2026-10-17T20:45:16Z on node 24.11.1 with OpenTelemetry SDK 2.12.0 (harness sdks/fixtures/otlp/record@e0893b3). Fixture: sdks/fixtures/otlp/vercel-ai-legacy/6.0.0.json.

Scenario	Provider	Model	Input tokens	Output tokens	Cached	Cache writes	Prompt	Completion	Finish reason	TTFT	Kind	Error class	Trace fields	Metadata	Usage rollup
error	captured	captured	not sent by the exporter	not sent by the exporter	not sent by the exporter	not sent by the exporter	captured	not sent by the exporter	not captured	not captured	captured	captured	captured	not captured	captured
generate_object	captured	captured	captured	captured	not sent by the exporter	not sent by the exporter	captured	captured	captured	not sent by the exporter	captured	captured	captured	not captured	captured
generate_text_with_metadata	captured	captured	captured	captured	not sent by the exporter	not sent by the exporter	captured	captured	captured	not sent by the exporter	captured	not captured	captured	captured	captured
stream_text	captured	captured	captured	captured	captured	not sent by the exporter	captured	captured	captured	captured	captured	not captured	captured	not captured	captured
tool_call	captured	captured	captured	captured	not sent by the exporter	not sent by the exporter	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not captured	captured

vercel-ai-legacy 7.0.142

Recorded 2026-10-17T20:45:20Z on node 24.11.1 with OpenTelemetry SDK 2.12.0 (harness sdks/fixtures/otlp/record@e0893b3). Fixture: sdks/fixtures/otlp/vercel-ai-legacy/7.0.142.json.

Scenario	Provider	Model	Input tokens	Output tokens	Cached	Cache writes	Prompt	Completion	Finish reason	TTFT	Kind	Error class	Trace fields	Metadata	Usage rollup
error	captured	captured	not sent by the exporter	not sent by the exporter	not sent by the exporter	not sent by the exporter	captured	not sent by the exporter	not captured	not captured	captured	captured	captured	not captured	captured
generate_object	captured	captured	captured	captured	captured	not sent by the exporter	captured	captured	captured	not sent by the exporter	captured	captured	captured	not captured	captured
generate_text_with_metadata	captured	captured	captured	captured	captured	not sent by the exporter	captured	captured	captured	not sent by the exporter	captured	not captured	captured	captured	captured
stream_text	captured	captured	captured	captured	captured	not sent by the exporter	captured	captured	captured	captured	captured	not captured	captured	not captured	captured
tool_call	captured	captured	captured	captured	captured	not sent by the exporter	captured	captured	captured	not sent by the exporter	captured	not captured	captured	not captured	captured

Related pages

• OTLP ingestion: send traces from any OpenTelemetry exporter over OTLP/HTTP.
• OTLP attribute mapping: which attribute fills which field.