Model detail
Grok 4.5
Grok 4.5 is SpaceXAI's smartest model with frontier performance on coding, knowledge work, and STEM.
Model specs
- Model ID
-
grok-4.5
- Context length
- 500K
- Max output
- 450K
- I/O modalities
- Released
- 2026-07
02
API endpoints
One MixRoute gateway, OpenAI-compatible
-
OpenAI-compatible
/v1/chat/completionsPOST
03
Tiered pricing
Unit: /1M Tokens
| Tier | Input /1M Tokens | Output /1M Tokens | Cache read /1M Tokens |
|---|---|---|---|
| standard Length ≤ 200K | $2.0000 | $6.0000 | $0.3000 |
| long_context Length > 200K | $4.0000 | $12.0000 | $0.6000 |
05
Selection summary
Quickly judge whether it fits your workload
What is this model good for?
SpaceXAI's smartest model with frontier performance on coding, knowledge work, and STEM
Grok 4.5 is SpaceXAI's smartest model with frontier performance on coding, knowledge work, and STEM.
What should you check before using it?
500,000 context, 450,000 output tokens
xAI model that supports reasoning, tool calling and structured output. Released 2026-07-08.
Why use it through MixRoute?
Grok 4.5 runs tools and structured output here
Tool calling and structured output run on that route as well. MixRoute serves Grok 4.5 on the OpenAI-compatible endpoint /v1/chat/completions; point your existing client at https://api.mixroute.ai/v1 with the model ID grok-4.5 and re-run your integration tests.
07
Capabilities & compatibility
Unconfirmed capabilities stay "Unknown," no guesses
Tool calling
Grok 4.5 supports function and tool calls.
tools definition; the response returns tool_calls to execute and feed results back.
Structured output
Grok 4.5 can produce JSON-formatted output on demand.
response_format: { type: "json_schema" } forces valid JSON output.
Streaming
Grok 4.5 supports streamed responses.
stream: true streams tokens incrementally, so chat UIs render as they arrive.
Prompt caching
Grok 4.5 supports prompt caching under supported routing conditions.
Vision input
Grok 4.5 can process image inputs alongside text.
image_url content part alongside text messages.
OpenAI SDK
Call Grok 4.5 through MixRoute's OpenAI-compatible endpoint.
base_url to https://api.mixroute.ai/v1; everything else follows the OpenAI style.
08
Token cost estimator
Live estimate from this page's pricing, not an actual bill
Share of the same prefix read repeatedly, up to 100%
09
FAQ
Grok 4.5 is a reasoning model. Reasoning effort can be tuned per request. Lower effort settings cut reasoning tokens and cost for routine work; reserve higher settings for problems that need deeper search. Measure quality at two or three settings before fixing one in production.
One endpoint, a testable decision
Test this model and alternate routes with the same request format
Start from a real workload, then let quality, total cost, and failure conditions decide whether to send production traffic.