Smart Stack

Side-by-side pricing, features and compliance for any tools in the directory.

GPT-5.6 Sol vs Grok 4.5

GPT-5.6 Sol

OpenAI

Pick it if: Sol replaces manual multi-agent orchestration for teams running the hardest coding and research workloads, not everyday chat. It's the default model inside the enterprise Copilot suite, so most business users already run it without choosing it directly, while cost-sensitive teams should route to a cheaper sibling model instead.

Its edge: State-of-the-art across coding, knowledge work, cybersecurity, and science benchmarks with 2x token efficiency vs competing flagships.

The catch: Premium pricing at $5/$30 per 1M tokens — 2.5x Terra, 5x Luna — limits high-volume use cases.

Grok 4.5

xAI

Pick it if: Grok 4.5 replaces Grok 4.3 as xAI's coding-focused model, fitting teams running high-volume agentic coding who want low cost per resolved task. It averages 15,954 output tokens per SWE-bench Pro task, well under Claude Opus 4.8's 67,020, at faster output speed than xAI's own prior release.

Its edge: Beats GPT-5.5 head-to-head on SWE-bench Pro (64.7% vs 58.6%), the one coding benchmark xAI chose to publish at launch.

The catch: No GPQA Diamond, AIME 2025, MMLU-Pro, or ARC-AGI 2 scores published at launch, so pure academic-reasoning performance is unverified.

Pricing

Input / 1M tokens$5$2
Output / 1M tokens$30$6
Cached input / 1M$0.625$0.5
Blended cost (3:1)$11.25$3
Free tierfalsefalse
Pricing modelper-tokenper-token

Verdict & fit

StrengthsState-of-the-art across coding, knowledge work, cybersecurity, and science benchmarks with 2x token efficiency vs competing flagships.; Ultra multi-agent mode coordinates parallel subagents for faster complex task completion — unique at thiBeats GPT-5.5 head-to-head on SWE-bench Pro (64.7% vs 58.6%), the one coding benchmark xAI chose to publish at launch.; Resolves the average coding-agent task in far fewer output tokens than Claude Opus 4.8, which compounds into lower real-
LimitationsPremium pricing at $5/$30 per 1M tokens — 2.5x Terra, 5x Luna — limits high-volume use cases.; Ultra mode and multi-agent beta features may have rough edges during early GA period.; No native audio/video I/O — vision only; multimodal lagginNo GPQA Diamond, AIME 2025, MMLU-Pro, or ARC-AGI 2 scores published at launch, so pure academic-reasoning performance is unverified.; Context window is the smallest of xAI's current model line-up, a real regression for teams with workflows

Capability envelope

Context window200K500K
Max output tokens64K
Input modalitiestext; imagetext; image; tool-calls
Output modalitiestext; tool-calls; codetext; tool-calls
CapabilitiesVision; Tool use; Code executionVision; Tool use; Web browsing
Reasoning modesnone; low; mediumlow; medium; high
Long-context recallhighunverified
Opennessproprietaryproprietary

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