LLM Reference

GPT-5.5 Instant vs Grok Build 0.1

GPT-5.5 Instant (2026) and Grok Build 0.1 (2026) compare a standalone API model against a coding-specialized model. GPT-5.5 Instant ships a 400k-token context window, while Grok Build 0.1 ships a 256k-token context window. On pricing, GPT-5.5 Instant costs $5/1M input tokens; Grok Build 0.1 ranges from $1 to $2/1M input tokens by tier. This page treats the result as workflow and deployment fit, not a universal model winner.

Treat this as a product-type comparison: GPT-5.5 Instant is standalone API model, while Grok Build 0.1 is coding-specialized model. Choose based on workflow fit before reading any benchmark or price row as decisive.

Decision scorecard

Local evidence first
SignalGPT-5.5 InstantGrok Build 0.1
Product typeStandalone API modelCoding-specialized model
Best formultimodal apps and tool-calling agentscustom coding agents, code generation, and tool loops
Decision fitCoding, RAG, and AgentsCoding, RAG, and Agents
Context window400k256k
Cheapest output$30/1M tokens$2/1M tokens
Provider routes1 tracked3 tracked
Shared benchmarks0 shared0 shared

Decision tradeoffs

Choose GPT-5.5 Instant when...
  • GPT-5.5 Instant has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • GPT-5.5 Instant uniquely exposes Code execution in local model data.
  • Local decision data tags GPT-5.5 Instant for Coding, RAG, and Agents.
Choose Grok Build 0.1 when...
  • Grok Build 0.1 has the lower cheapest tracked output price at $2/1M tokens.
  • Grok Build 0.1 has broader tracked provider coverage for fallback and route flexibility.
  • Grok Build 0.1 uniquely exposes Reasoning in local model data.
  • Local decision data tags Grok Build 0.1 for Coding, RAG, and Agents.

Monthly cost at traffic

Estimate token spend from the cheapest tracked input and output route or tier on this page.

Lower estimate Grok Build 0.1

GPT-5.5 Instant

$11,500

Cheapest tracked route/tier: OpenAI API

Grok Build 0.1

$1,300

Cheapest tracked route/tier: xAI Console

Estimated monthly gap: $10,200. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

GPT-5.5 Instant -> Grok Build 0.1
  • No overlapping tracked provider route is sourced for GPT-5.5 Instant and Grok Build 0.1; plan for SDK, billing, or endpoint changes.
  • Grok Build 0.1 is $28/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
  • Check replacement coverage for Code execution before moving production traffic.
  • Grok Build 0.1 adds Reasoning in local capability data.
Grok Build 0.1 -> GPT-5.5 Instant
  • No overlapping tracked provider route is sourced for Grok Build 0.1 and GPT-5.5 Instant; plan for SDK, billing, or endpoint changes.
  • GPT-5.5 Instant is $28/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • Check replacement coverage for Reasoning before moving production traffic.
  • GPT-5.5 Instant adds Code execution in local capability data.

Specs

Specification
Released2026-05-052026-05-14
Context window400k256k
Parameters——
ArchitectureDecoder Only-
LicenseProprietaryProprietary
OpennessProprietaryProprietary
WeightsNot releasedNot released
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: conditional
Knowledge cutoff2025-08-

Pricing and availability

Pricing attributeGPT-5.5 InstantGrok Build 0.1
Input price$5/1M tokens
0-200,001t
$1/1M tokens
200,001t+
$2/1M tokens
Output price$30/1M tokens
0-200,001t
$2/1M tokens
200,001t+
$4/1M tokens
Providers
OpenAI API
xAI ConsoleVercel AI GatewayOpenRouter

Capabilities

CapabilityGPT-5.5 InstantGrok Build 0.1
VisionYesYes
MultimodalYesYes
ReasoningNoYes
JSON / Tool useYesYes
Structured outputsYesYes
Code executionYesNo
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

No shared benchmark scores are currently available for this pair.

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Model pages
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Last reviewed: 2026-07-10. Data sourced from public model cards and provider documentation.