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© 2026 CompareLLM. Public benchmark data aggregated from Arena Elo, LiveBench, SWE-bench & OpenRouter.

Every score has a dated snapshot.

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  2. Comparisons
  3. GPT-5 vs Reka Flash 3

Pairwise benchmark snapshot · Aug 17, 2026noindex (thin pair)

GPT-5 vs Reka Flash 3 benchmark

In this head-to-head showdown, Reka Flash 3 is more budget-friendly at $0.2/1M per 1M output tokens. Review the complete breakdown below to determine which model best fits your performance and budget requirements.

Executive Comparison Verdict

Bottom Line: Choose GPT-5 if your priority is peak reasoning, complex code generation, and top preference Elo. Choose Reka Flash 3 if you are optimizing for low latency, high throughput, and cost-efficient API deployment.
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OpenAI
GPT-5

OpenAI flagship reasoning model for 2025–26. Strong general preference Elo and multimodal coverage.

Elo 1,558$10/1M out
rekaai
Reka Flash 3

Auto-discovered from OpenRouter (rekaai/reka-flash-3). Preview until a second source matches.

$0.19999999999999998/1M out

GPT-5 Thinking Depth & Cost Scaler

Simulate accuracy gains vs added response time & token cost

Mode: Medium (Standard)

Reasoning models “think before answering” by generating internal reasoning tokens. Higher effort improves math, coding, and logic accuracy, but increases response delay and token costs.

Thinking Delay
290 ms
Standard speed
Reasoning Depth
~1,500
Internal tokens
Cost / 1k Calls
$18.63
5.1× standard bill
Accuracy Boost
+4.5% accuracy
STEM & SWE-bench
Top Rival Showdowns for GPT-5
All Matchups
Compare vs:vs Claude Opus 4.5vs Gemini 3 Provs Grok 4.6vs DeepSeek V4 Provs Qwen 3 Max
Preference Leader

No shared data

Single model data

Throughput Leader

No shared data

No latency data

Value per Dollar Leader

Reka Flash 3

$0.19999999999999998 / 1M output

Capability Percentiles

Relative percentile scores computed across all active models in the benchmark catalog.

Capability Matchup Radar

Multi-Dimensional Capability Radar

Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.

Tap any node to inspect
Percentile 0–100
Dimensional AdvantageGPT-5 5/6
Head-to-Head Comparison

Overall Matchup Breakdown

Category wins across reasoning intelligence, generation speed, and token cost.

GPT-5 (8)vsReka Flash 3 (2)
GPT-5: 8W (80%)Overall: GPT-5Reka Flash 3: 2W (20%)
← GPT-5Reka Flash 3 →
GPT-5 (5/5)

Intelligence & Reasoning

Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy

Preference Elo
1,558vs—
Coding Elo
1,540vs—
SWE-bench
68.4%vs—
LiveBench
69.8%vs—
GPQA Diamond
85.2%vs—
GPT-5: 5WReka Flash 3: 0W
GPT-5 (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed
78 tok/svs—
Time to first token
290 msvs—
GPT-5: 2WReka Flash 3: 0W
Reka Flash 3 (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price
$10/1Mvs$0.2/1M
Input price
$1.25/1Mvs$0.1/1M
Context window
400kvs66k
GPT-5: 1WReka Flash 3: 2W

Side-by-Side Benchmark Matrix

Preference Elo
GPT-51,558
lmarena · Aug 17, 2026
Reka Flash 3—
Coding Elo
GPT-51,540
lmarena · Aug 17, 2026
Reka Flash 3—
LiveBench
GPT-569.8%
livebench · Aug 17, 2026
Reka Flash 3—
SWE-bench
GPT-568.4%
swebench · Aug 17, 2026
Reka Flash 3—
GPQA Diamond
GPT-585.2%
seed-bootstrap · Aug 1, 2026
Reka Flash 3—
Time to first token
GPT-5290 ms
seed-bootstrap · Aug 1, 2026
Reka Flash 3—
Output speed
GPT-578 tok/s
seed-bootstrap · Aug 1, 2026
Reka Flash 3—
Input priceReka Flash 3 (+$1.15/1M)
GPT-5$1.25/1M
openrouter · Aug 17, 2026
Reka Flash 3$0.1/1M
openrouter · Aug 17, 2026
Output priceReka Flash 3 (+$9.8/1M)
GPT-5$10/1M
openrouter · Aug 17, 2026
Reka Flash 3$0.2/1M
openrouter · Aug 17, 2026
Context windowGPT-5 (+334k)
GPT-5400k
openrouter · Aug 17, 2026
Reka Flash 366k
openrouter · Aug 17, 2026
BenchmarkGPT-5Reka Flash 3Advantage Delta
Preference Elo
1,558
lmarena · Aug 17, 2026
——
Coding Elo
1,540
lmarena · Aug 17, 2026
——
LiveBench
69.8%
livebench · Aug 17, 2026
——
SWE-bench
68.4%
swebench · Aug 17, 2026
——
GPQA Diamond
85.2%
seed-bootstrap · Aug 1, 2026
——
Time to first token
290 ms
seed-bootstrap · Aug 1, 2026
——
Output speed
78 tok/s
seed-bootstrap · Aug 1, 2026
——
Input price
$1.25/1M
openrouter · Aug 17, 2026
$0.1/1M
openrouter · Aug 17, 2026
Reka Flash 3 (+$1.15/1M)
Output price
$10/1M
openrouter · Aug 17, 2026
$0.2/1M
openrouter · Aug 17, 2026
Reka Flash 3 (+$9.8/1M)
Context window
400k
openrouter · Aug 17, 2026
66k
openrouter · Aug 17, 2026
GPT-5 (+334k)
Interactive Simulator (USD)

Workload Cost & Savings Calculator

Simulate monthly production API costs in USD (US Dollar).

Save up to 97% with Reka Flash 3
Monthly Volume50M tokens/mo
Quick Presets:
Token Ratio (In vs Out)70% In / 30% Out
RAG / Search (10% out)Coding / Chat (50% out)
GPT-5$193.75 / mo
In: $43.75Out: $150
Reka Flash 3$6.50 / mo
In: $3.5Out: $3
Estimated Cost Delta

Reka Flash 3 is estimated to save $187.25/month ($2,247/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

  • 1
    Reka Flash 3:Pick Reka Flash 3 when you are optimizing output cost.

Recommended Workload Routing

Repo / coding agentsinsufficient data

Need SWE-bench on both sides.

High-volume chatReka Flash 3

Lower output list price ($0.2/1M).

Voice / low-latency UIinsufficient data

Need TTFT on both sides.

Long-document RAGGPT-5

Larger window (400k).

Screenshots / visionGPT-5

GPT-5 is the side marked multimodal in the catalog.

Target WorkloadRecommended PickEvaluation Rationale
Repo / coding agentsinsufficient dataNeed SWE-bench on both sides.
High-volume chatReka Flash 3Lower output list price ($0.2/1M).
Voice / low-latency UIinsufficient dataNeed TTFT on both sides.
Long-document RAGGPT-5Larger window (400k).
Screenshots / visionGPT-5GPT-5 is the side marked multimodal in the catalog.

Related Editorial Dispatches & Benchmark Notes

View all news
launchAug 8, 2025

GPT-5 (2025) remains the legacy OpenAI flagship baseline

Still a common compare target. 5.6 Sol replaced it as the buy; GPT-5 stays for old URLs.

Community Sentiment

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CompareLLM Matrix

Verified head-to-head card

LIVE
VS
OpenAI

GPT-5

Elo 1,558
LiveBench69.8%
SWE-bench68.4%
Speed78 tok/s
Output cost$10/1M
rekaai

Reka Flash 3

Elo n/a
LiveBench—
SWE-bench—
Speed—
Output cost$0.2/1M

Frequently Asked Questions

Which is better overall, GPT-5 or Reka Flash 3?
We do not have preference Elo for both models, so we do not declare an overall winner. Compare the metrics that exist.
Which is better at coding, GPT-5 or Reka Flash 3?
SWE-bench is missing for at least one model, so we do not rank coding from a single number.
Which is cheaper to run in production?
Reka Flash 3 output tokens are $0.2/1M versus $10/1M. Input prices and retry rates still move the real bill.
Which is faster, GPT-5 or Reka Flash 3?
We do not have TTFT for both models.
Which has the larger context window?
GPT-5 accepts 400k tokens versus 66k.
Can I self-host either model?
Neither model is marked open-weights here. You are comparing hosted APIs.
Are these scores from CompareLLM’s own evals?
No. V1 aggregates public leaderboards (and optional first-party latency pings). Each cell names its source and date. Read /methodology.
What does preference Elo mean on this page?
Preference Elo is a crowd vote from LMArena / Arena. People see two hidden answers and pick the one they like more. The model that wins more often gets a higher Elo. That means people preferred it — not that it passed a school test. It is not SWE-bench, not accuracy, and not a number we invent. GPT-5 and Reka Flash 3 Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Related news

  • launch · Aug 8, 2025

    GPT-5 (2025) remains the legacy OpenAI flagship baseline

Similar Head-to-Head Comparisons

All GPT-5 matchups →|All Reka Flash 3 matchups →
GPT-5 vs GPT-4.5 Orion (previous gpt-flagship)GPT-5 vs GPT-5.6 Sol (next gpt-flagship)GPT-5.6 Terra vs GPT-5OpenAI: o3 Mini vs GPT-5OpenAI: o1 vs GPT-5GLM-5.3 vs GPT-5