Model comparison
GPT-4o vs Grok Code Fast 1
Head-to-head evidence from 11 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-4o #165 (Supported); Grok Code Fast 1 #180 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-4o and Grok Code Fast 1 share 11 comparable benchmark results. 0 of 8 categories are comparable. 2 results are unique to GPT-4o; 1 to Grok Code Fast 1.
Updated July 20, 2026- Shared results
- 11
- GPT-4o only
- 2
- Grok Code Fast 1 only
- 1
- Comparable categories
- 0 / 8
Benchmark data for GPT-4o and Grok Code Fast 1 is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 11 shared benchmark results across 5 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
GPT-4o is priced at $2.50 input / $10.00 output per 1M tokens, versus $0.20 input / $1.50 output per 1M tokens for Grok Code Fast 1. Grok Code Fast 1 has the larger context window at 256K, compared with 128K for GPT-4o.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | GPT-4o | Δ | Grok Code Fast 1 |
|---|---|---|---|
| Coding | GPT-4oNot measured | MarginNo overlap | Grok Code Fast 170.8 |
| Math | GPT-4o0.3 | MarginNo overlap | Grok Code Fast 1Not measured |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-4o | Grok Code Fast 1 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-4o$2.5 input / $10 output | Grok Code Fast 1$0.2 input / $1.5 output | Grok Code Fast 1 has the lower combined listed price. |
| Generation speedtokens per second | GPT-4o131 tok/s | Grok Code Fast 1172 tok/s | Grok Code Fast 1 has the higher measured throughput. |
| First-answer latencyseconds to first token | GPT-4o0.81 s | Grok Code Fast 12.81 s | GPT-4o reaches the first token sooner. |
| Context windowmaximum listed tokens | GPT-4o128K | Grok Code Fast 1256K | Grok Code Fast 1 lists the larger context window. |
Benchmark Deep Dive
Agentic1 benchmarks
| Benchmark | GPT-4o | Grok Code Fast 1 | Result |
|---|---|---|---|
| τ²-bench resultsSource | 25.1% | 75.7% | Grok Code Fast 1 leads |
Coding2 benchmarks
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | GPT-4o | Grok Code Fast 1 | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 11.2% | 21.6% | Grok Code Fast 1 leads |
| AA-GPQA DiamondSource | 54.3% | 72.7% | Grok Code Fast 1 leads |
| AA-HLESource | 3.3% | 7.5% | Grok Code Fast 1 leads |
| AA-Omniscience IndexSource | -10.7% | -36.0% | GPT-4o leads |
| AA-Omniscience AccuracySource | 19.7% | 23.8% | Grok Code Fast 1 leads |
| AA-Omniscience Hallucination RateSource | 37.9% | 78.5% | GPT-4o leads |
Math1 benchmarks
| Benchmark | GPT-4o | Grok Code Fast 1 | Result |
|---|---|---|---|
| FrontierMath v2 (Tiers 1-3)Source | 0.345% | — | Not comparable |
Multimodal1 benchmarks
| Benchmark | GPT-4o | Grok Code Fast 1 | Result |
|---|---|---|---|
| Design Arena WebsiteSource | 864 | — | Not comparable |
Inst. Following1 benchmarks
| Benchmark | GPT-4o | Grok Code Fast 1 | Result |
|---|---|---|---|
| AA-IFBenchSource | 34.3% | 41.4% | Grok Code Fast 1 leads |
Frequently Asked Questions (3)
Can I compare GPT-4o and Grok Code Fast 1 on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for GPT-4o and Grok Code Fast 1 today?
GPT-4o: $2.50 input / $10.00 output per 1M tokens Grok Code Fast 1: $0.20 input / $1.50 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
Related Comparisons
Explore More
Choose a model with this week’s evidence
Join 2,000+ readers for ranking moves, pricing changes, and the claims that still need proof.
One email each week. Unsubscribe anytime.